Ribbon Communications Inc. Releases Fourth Quarter 2017 Financial Results

WESTFORD, Mass., March 1, 2018 /PRNewswire/ -- Ribbon Communications Inc. (Nasdaq: RBBN), a global leader in secure and intelligent cloud communications, today announced results for the fourth quarter ended December 31, 2017.

"I'm very pleased to have concluded the merger transaction and the launch of Ribbon in the marketplace. Ribbon's increased scale, global footprint, expanded product offerings and combined customer base will benefit our customers, who count on us as trusted long-term partners," said Fritz Hobbs, President and Chief Executive Officer. "The combined company's performance through the end of the year met or exceeded all of our guidance. We made solid progress on operationalizing cost synergies and now expect well over $50 million in cost synergies in 2018," continued Hobbs.

"Ribbon delivered solid fourth quarter results driven by strength in our SBC sales. Our merger integration plans kicked off in earnest and we made substantial progress," said Daryl Raiford, Chief Financial Officer. "Looking to 2018, we are guiding for Adjusted EBITDA of $75 million, a dramatic increase over 2017," continued Raiford.

Q417 Customer Highlights:

    --  Awarded a large Asian network interconnect deal based on cloud and GPU
        (graphics processing unit) technology, demonstrating Ribbon's highly
        differentiated NFV (network functions virtualization) strategy and
        evidence of the secular shift to virtualization and cloud architecture.
        This deal is expected to generate revenue in early 2019.
    --  Booked a significant gateway trunking contract with a large U.S. MSO
        (multiple system operator), illustrating the continued demand by MSOs to
        transform their legacy networks to IP.
    --  Booked new network transformation projects for three service providers
        in Canada.
    --  A large North American Tier 1 service provider deployed Ribbon's
        Converged Intelligent Messaging NFV solution, supporting business and
        residential customers, highlighting further progress on network
        virtualization.

Q417 Financial Highlights(1,2)

    --  GAAP total revenue was $146.2 million, compared to $67.6 million in the
        fourth quarter of 2016.
    --  Non-GAAP total revenue was $169.5 million, compared to $67.6 million in
        the fourth quarter of 2016.
    --  GAAP net loss was $15.7 million, compared to $2.6 million in the fourth
        quarter of 2016.
    --  GAAP loss per share was $0.18, compared to $0.05 in the fourth quarter
        of 2016.
    --  Non-GAAP diluted earnings per share was $0.27, compared to $0.09 in the
        fourth quarter of 2016.
    --  Non-GAAP Adjusted EBITDA was $27.8 million, compared to $7.0 million in
        the fourth quarter of 2016.

FY17 Financial Highlights(1,2)

    --  GAAP total revenue was $329.9 million, compared to $252.6 million in
        2016.
    --  Non-GAAP total revenue was $353.2 million, compared to $252.6 million in
        2016.
    --  GAAP net loss was $35.3 million, compared to $13.9 million in 2016.
    --  GAAP loss per share was $0.60, compared to $0.28 in 2016.
    --  Non-GAAP diluted earnings per share was $0.51, compared to $0.33 in
        2016.
    --  Non-GAAP Adjusted EBITDA was $40.9 million, compared to $26.1 million in
        2016.

Cash and investments were $83.3 million at the end of the fourth quarter of 2017, compared to $131.6 million at the end of the third quarter of 2017. The decrease was primarily due to net cash of $43 million used for the merger of Sonus and GENBAND. Cash flow from operations was basically break-even for the quarter.

(1) The Sonus-GENBAND merger occurred on October 27, 2017. The consolidated financial results included in this press release represent the consolidated financial results of Sonus Networks, Inc., prior to October 27, 2017, and the consolidated financial results of Ribbon, on and after such date. The financial results of GENBAND are included in Ribbon's consolidated financial results beginning October 27, 2017.
(2) Please see the reconciliation of non-GAAP and GAAP financial measures, and additional information about non-GAAP measures, in the press release appendix.

Conference Call Details
The Company will offer a live, listen-only webcast of the conference call to discuss the complete financial results of Ribbon for the fourth quarter ended December 31, 2017 on March 1, 2018, via the investor section of its website at http://investors.ribboncommunications.com/, where a replay will also be available shortly following the conference call.

Conference call details:
Date: March 1, 2018
Time: 8:30 a.m. (ET)
Dial-in number: 888-224-7971 - International callers: +1-303-223-4386

Replay information:
A telephone playback of the call will be available following the conference call until March 15, 2018 and can be accessed by calling 800-633-8284 or +1-402-977-9140 for international callers. The reservation number for the replay is 21880364.

About Ribbon Communications
Ribbon Communications is a company with two decades of leadership in real-time communications. Built on world-class technology and intellectual property, the company delivers intelligent, secure, embedded real-time communications for today's world. The company transforms fixed, mobile and enterprise networks from legacy environments to secure IP and cloud-based architectures, enabling highly productive communications for consumers and businesses. With 64 locations in 27 countries around the globe, Ribbon's innovative, market-leading portfolio empowers service providers and enterprises with rapid service creation in a fully virtualized environment. The company's Kandy Communications Platform as a Service (CPaaS) delivers a comprehensive set of advanced embedded communications capabilities that enables this transformation. To learn more, visit https://ribboncommunications.com/.

Important Information Regarding Forward-Looking Statements
This press release contains "forward-looking statements" within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, which are subject to a number of risks and uncertainties. All statements other than statements of historical facts contained in this press release, including statements made by our executive officers in the introductory paragraphs, and statements regarding expected cost synergies, earnings and cash flow from operations, future results of operations and financial position, timing of anticipated revenue generation, integration efforts and opportunities, business strategy, strategic position, plans and objectives of management for future operations and plans for future product development and manufacturing are forward-looking statements. Without limiting the foregoing, the words "anticipates", "believes", "could", "estimates", "expects", "expectations", "intends", "may", "plans", "seeks", "projects" and other similar language, whether in the negative or affirmative, are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words.

Forward-looking statements are based on our current expectations and assumptions regarding our business, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Actual results could differ materially from those anticipated in these forward-looking statements as a result of various important factors, including, but not limited to, our success integrating the respective businesses of Sonus Networks, Inc. ("Sonus") and GENBAND Holdings Company ("GENBAND"); achievement of the anticipated synergies of the transaction between Sonus and GENBAND (the "Transaction"); our ability to realize the benefits from the Transaction; the effects of disruption from the Transaction, making it more difficult to maintain relationships with employees, customers, business partners or government entities; the timing of customer purchasing decisions and our recognition of revenues; economic conditions; our ability to recruit and retain key personnel; difficulties supporting our strategic focus on channel sales; difficulties retaining and expanding our customer base; difficulties leveraging market opportunities; the impact of restructuring and cost-containment activities; litigation; actions taken by significant stockholders; difficulties providing solutions that meet the needs of customers; market acceptance of our products and services; rapid technological and market change; our ability to protect our intellectual property rights; our ability to maintain partner, reseller, distribution and vendor support and supply relationships; higher risks in international operations and markets; the impact of increased competition; currency fluctuations; changes in the market price of our common stock; and/or failure or circumvention of our controls and procedures.

Our forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. We caution you against relying on any of these forward-looking statements. Important factors that could cause actual results to differ materially from these forward-looking statements are discussed in Part II, Item IA "Risk Factors", Part I, Item 2 "Management's Discussion and Analysis of Financial Condition and Results of Operations" and Part I, Item 3 "Quantitative and Qualitative Disclosures About Market Risk" in our most recent Quarterly Report on Form 10-Q filed with the SEC and our other filings with the SEC. Any forward-looking statement made by us in this press release speaks only as of the date of this press release. Factors or events that could cause our actual results to differ may emerge from time to time, and it is not possible for us to predict all of them. We undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by law.

Discussion of Non-GAAP Financial Measures
Ribbon management uses several different financial measures, both GAAP and non-GAAP, in analyzing and assessing the overall performance of the business, making operating decisions, planning and forecasting future periods, and determining payments under compensation programs. Our annual financial plan is prepared both on a GAAP and non-GAAP basis, and the non-GAAP annual financial plan is approved by our board of directors. Continuous budgeting and forecasting for revenue and expenses are conducted on a non-GAAP basis (in addition to GAAP) and actual results on a non-GAAP basis are assessed against the annual financial plan. We consider the use of non-GAAP financial measures helpful in assessing the core performance of our continuing operations and when planning and forecasting future periods. By continuing operations, we mean the ongoing results of the business adjusted for acquisition-related revenue as a result of purchase accounting and the related cost of revenue, the impact of the new revenue standard, and excluding certain expenses and credits, including, but not limited to stock-based compensation, amortization and impairment of intangible assets, merger integration costs, settlement expense, certain litigation costs, acquisition- and integration-related expense, restructuring, certain gains included in other income, net, and income tax benefits arising from purchase accounting and tax reform. While our management uses non-GAAP financial measures as a tool to enhance their understanding of certain aspects of our financial performance, our management does not consider these measures to be a substitute for, or superior to, GAAP measures. In addition, our presentations of these measures may not be comparable to similarly titled measures used by other companies. These non-GAAP financial measures should not be considered alternatives for, or in isolation from, the financial information prepared and presented in accordance with GAAP.

Investors are cautioned that there are material limitations associated with the use of non-GAAP financial measures as an analytical tool. In particular, many of the adjustments to Ribbon's financial measures reflect the exclusion of items that are recurring and will be reflected in our financial results for the foreseeable future.

Acquisition-Related Revenue and Cost of Revenue; Impact of New Revenue Standard
We provide the supplementary non-GAAP financial measures, Non-GAAP Product revenue, Non-GAAP Service revenue and Non-GAAP Total revenue, which include revenue related to the acquisition of GENBAND that we would have recognized but for the purchase accounting treatment of these transactions. Because GAAP accounting requires the elimination of this revenue, as well as the impact on future revenue of our adoption in 2018 of the new revenue standard, GAAP results alone do not fully capture all of our economic activities. These non-GAAP adjustments are intended to reflect the full amounts of such revenue and the related cost of revenue. We also add back the revenue related to the acquisition of GENBAND and the related cost of such revenue when calculating other of our non-GAAP operating results. We include these adjustments, which primarily relate to the acquisition of GENBAND, to allow for more complete comparisons to the financial results of our historical operations, forward-looking guidance and the financial results of peer companies. We believe these adjustments are useful to management and investors as a measure of the ongoing performance of the business because, although we cannot be certain that customers will renew the relevant GENBAND contracts, we have historically experienced high renewal rates on maintenance and support agreements and certain other customer contracts. These adjustments do not accelerate revenue, but instead include revenue (and the related cost of revenue) that would have been recognized in our 2017 results, and included in our 2018 guidance and results, but for the purchase accounting and new revenue standard adjustments required by GAAP.

Stock-Based Compensation
Stock-based compensation expense is different from other forms of compensation, as it is a non-cash expense. For example, a cash salary generally has a fixed and unvarying cash cost. In contrast, the expense associated with an equity-based award is generally unrelated to the amount of cash ultimately received by the employee, and the cost to us is based on a stock-based compensation valuation methodology, subjective assumptions and the variety of award types, all of which may vary over time. We evaluate performance without these measures because stock-based compensation expense is influenced by the Company's stock price and other factors such as volatility and interest rates that are beyond our control. The expense related to stock-based awards is generally not controllable in the short-term and can vary significantly based on the timing, size and nature of awards granted. As such, we do not include such charges in our operating plans, and we believe that presenting non-GAAP operating results that exclude stock-based compensation provides investors with visibility and insight into our management's method of analysis and the Company's core operating performance. Stock-based compensation will continue in future periods.

Amortization of Intangible Assets
We exclude the amortization of acquired intangible assets from non-GAAP expense and income measures. These amortization amounts are inconsistent in frequency and amount and are significantly impacted by the timing and size of acquisitions. Although we exclude amortization of acquired intangible assets from our non-GAAP expenses, we believe that it is important for investors to understand that intangible assets contribute to revenue generation. We believe that excluding the non-cash amortization of intangible assets facilitates the comparison of our financial results to our historical operating results and to other companies in our industry as if the acquired intangible assets had been developed internally rather than acquired. Amortization of intangible assets that relate to past acquisitions will recur in future periods until such intangible assets have been fully amortized. Future acquisitions may result in the amortization of additional intangible assets.

Impairment of Intangible Assets
In the fourth quarter of 2017, we discontinued our ongoing development of certain intangible assets that we had previously acquired, as we had determined that there were no alternative uses of the technology within either our existing or future product lines. As a result, we recorded an impairment charge of $5.5 million to write down the carrying value of the assets to zero. Had we developed those intangible assets internally and made the decision to discontinue their ongoing development, we would have ceased work on such development projects and eliminated the related future costs. Because we do not capitalize these costs, there would have been no asset to write off. As a result, we believe that excluding non-cash impairment charges from our non-GAAP operating results as if these impaired intangible assets had been developed internally rather than acquired facilitates a comparison to our historical operating results and to other companies in our industry.

Settlement Expense
In September 2017, we recorded $1.6 million of expense related to potential fines in connection with the ongoing SEC investigation and an additional $0.3 million of expense in connection with this matter in December 2017. In June 2016, we recorded $0.6 million for patent litigation settlement costs. These amounts are included as components of general and administrative expense. We believe that such settlement costs are not part of our core business or ongoing operations, are unplanned and generally not within our control. Accordingly, we believe that excluding costs such as the SEC potential fines and patent litigation settlement expense facilitates the comparison of our financial results to our historical operating results and to other companies in our industry.

Litigation Costs
In connection with certain ongoing litigation between GENBAND, as plaintiff, and one of its competitors, we incurred litigation costs in the fourth quarter of 2017, and expect to incur significant future litigation costs. These costs are included as a component of general and administrative expense. We believe that such costs are not part of our core business or ongoing operations, are unplanned and generally not within our control. Accordingly, we believe that excluding the litigation costs related to this specific legal matter facilitates the comparison of our financial results to our historical operating results and to other companies in our industry.

Acquisition- and Integration-Related Costs
We consider certain acquisition- and integration-related costs to be unpredictable and dependent on a significant number of factors that may be outside of our control. We do not consider these acquisition- and integration-related costs to be related to the organic continuing operations of our acquired businesses or to the Company and they are generally not relevant to assessing or estimating the long-term performance of the acquired assets. In addition, the size, complexity and/or volume of an acquisition, which often drives the magnitude of acquisition- and integration-related costs, may not be indicative of future acquisition- and integration-related costs. By excluding these acquisition- and integration-related costs from our non-GAAP measures, management is better able to evaluate our ability to utilize our existing assets and estimate the long-term value that acquired assets will generate for us. We exclude certain acquisition- and integration-related costs to allow more accurate comparisons of our financial results to our historical operations, forward-looking guidance and the financial results of less acquisitive peer companies. In addition, we believe that providing supplemental non-GAAP measures that exclude these items allows management and investors to consider the ongoing operations of the business both with and without such expenses.

Restructuring
We have recorded restructuring expense to streamline operations and reduce operating costs by closing and consolidating certain facilities and reducing our worldwide workforce. We review our restructuring accruals regularly and record adjustments (both expense and credits) to these estimates as required. We believe that excluding restructuring expense and credits facilitates the comparison of our financial results to our historical operating results and to other companies in our industry, as there are no future revenue streams or other benefits associated with these costs.

Gain on Sales of Intangible Assets
In both 2017 and 2016, we sold intangible assets that we had acquired in connection with two previous acquisitions. These amounts, aggregating $0.6 million in 2017 and $1.3 million in 2016, are included as components of other income, net. We believe that such gains are not part of our core business or ongoing operations, as we had not used the intangible assets in connection with revenue-producing activities and would not have used them as such in the future. Accordingly, we believe that excluding the other income arising from these sales from our results facilitates the comparison of our financial results to our historical results and to other companies in our industry.

Tax Benefits Arising from Purchase Accounting and Tax Reform
In the fourth quarter of 2017, we assessed our ability to use our tax benefits and determined that it was more likely than not that some of these benefits will be recognized. As a result, the valuation allowance was reduced in connection with the GENBAND transaction, resulting in an income tax benefit of $16.4 million. In addition, we recognized an income tax benefit of $4.8 million related to the Tax Cut and Jobs Act of 2017. We believe that such benefits are not part of our core business or ongoing operations, as they are either the result of acquisitions or new tax legislation, neither of which relates to our revenue-producing activities. Accordingly, we believe that excluding the benefits arising from these adjustments to our income tax provision facilitates the comparison of our financial results to our historical results and to other companies in our industry.

Adjusted EBITDA
We use Adjusted EBITDA as a supplemental measure to review and assess our performance. We calculate Adjusted EBITDA by excluding from net income (loss): interest income (expense), net; income tax benefit (provision); depreciation; and amortization and impairment of intangible assets. In addition, we exclude from net income (loss): adjustments to revenue and cost of revenue related to revenue reductions resulting from purchase accounting; stock-based compensation; settlement expense; certain litigation costs; acquisition- and integration-related expense; restructuring; and other income, net. In general, we add back the expenses that we consider to be non-cash and/or not part of our ongoing operations. Adjusted EBITDA is a non-GAAP financial measure that is used by our investing community for comparative and valuation purposes. We disclose this metric to support and facilitate our dialogue with research analysts and investors. Other companies may calculate Adjusted EBITDA differently than we do, limiting its usefulness as a comparative measure.

We believe that providing non-GAAP information to investors, in addition to the GAAP presentation, will allow investors to view the financial results in the way management views them. We further believe that providing this information helps investors to better understand our core financial and operating performance and evaluate the efficacy of the methodology and information used by our management to evaluate and measure such performance.

Investor Relations:
Sara Leggat
+1 (978) 614-8841
sleggat@rbbn.com

US Press
Dennis Watson
+1 (214) 695 2224
dwatson@rbbn.com

International Press
Catherine Berthier
+1.646.741.1974
cberthier@rbbn.com


                                                                                        RIBBON COMMUNICATIONS INC.

                                                                                   Consolidated Statements of Operations

                                                                         (in thousands, except percentages and per share amounts)

                                                                                                (unaudited)



                                                                                                      Three months ended
                                                                                                      ------------------

                                                                                                    December 31,                          September 30,                     December 31,

                                                                                                                           2017                               2017                               2016
                                                                                                                           ----                               ----                               ----

    Revenue:

                                    Product                                $82,814                                                $44,120                           $37,662

                                    Service                                 63,398                                                 30,509                            29,910
                                    -------

                                    Total revenue                          146,212                                                 74,629                            67,572
                                                                           -------                                                 ------                            ------


    Cost of revenue:

                                    Product                                 41,502                                                  9,708                            12,137

                                    Service                                 27,911                                                 10,374                            10,041
                                    -------

                                    Total cost of revenue                   69,413                                                 20,082                            22,178
                                                                            ------                                                 ------                            ------


    Gross profit                                                                                                      76,799                             54,547                             45,394
                                                                                                                      ------                             ------                             ------


    Gross margin:

                                    Product                                  49.9%                                                 78.0%                            67.8%

                                    Service                                  56.0%                                                 66.0%                            66.4%

                                    Total gross margin                       52.5%                                                 73.1%                            67.2%


    Operating expenses:

                                    Research and development                40,410                                                 20,798                            19,836

                                    Sales and marketing                     35,553                                                 17,454                            17,649

                                    General and administrative              19,649                                                 10,833                             9,292

                                    Acquisition- and integration-related     8,485                                                  1,543                               201

                                    Restructuring                            8,365                                                      -                            1,120

                                    Total operating expenses               112,462                                                 50,628                            48,098
                                                                           -------                                                 ------                            ------


    Income (loss) from operations                                                                                   (35,663)                             3,919                            (2,704)

    Interest income (expense), net                                                                                     (509)                               260                                179

    Other income, net                                                                                                    697                                  1                                508
                                                                                                                         ---                                ---                                ---


    Income (loss) before income taxes                                                                               (35,475)                             4,180                            (2,017)

    Income tax benefit (provision)                                                                                    19,761                              (727)                             (614)
                                                                                                                      ------                               ----                               ----


    Net income (loss)                                                                                              $(15,714)                            $3,453                           $(2,631)
                                                                                                                    ========                             ======                            =======


    Earnings (loss) per share:

                                    Basic                                                                               $(0.18)                             $0.07                            $(0.05)

                                    Diluted                                $(0.18)                                                 $0.07                           $(0.05)


    Shares used to compute earnings (loss) per share:

                                    Basic                                                                                86,567                             49,753                             49,232

                                    Diluted                                 86,567                                                 50,131                            49,232


                                                    RIBBON COMMUNICATIONS INC.

                                              Consolidated Statements of Operations

                                     (in thousands, except percentages and per share amounts)

                                                           (unaudited)



                                                                       Year ended
                                                                       ----------

                                                                      December 31,                     December 31,

                                                                                     2017                              2016
                                                                                     ----                              ----

    Revenue:

                            Product                $181,119                                   $146,381

                            Service                 148,823                                    106,210
                            -------

                             Total
                             revenue                329,942                                    252,591
                                                    -------                                    -------


    Cost of revenue:

                            Product                  70,250                                     47,367

                            Service                  58,196                                     37,613
                            -------

                             Total cost
                             of
                             revenue                128,446                                     84,980
                                                    -------                                     ------


    Gross profit                                                               201,496                           167,611
                                                                               -------                           -------


    Gross margin:

                            Product                   61.2%                                     67.6%

                            Service                   60.9%                                     64.6%

                             Total
                             gross
                             margin                   61.1%                                     66.4%


    Operating expenses:

                             Research and
                             development            101,481                                     72,841

                             Sales and
                             marketing               83,403                                     68,539

                             General and
                             administrative          47,642                                     35,948

                             Acquisition-
                             and
                             integration-
                             related                 14,763                                      1,152

                            Restructuring             9,436                                      2,740

                             Total
                             operating
                             expenses               256,725                                    181,220
                                                    -------                                    -------


    Loss from operations                                                      (55,229)                         (13,609)

    Interest income, net                                                           263                               769

    Other income, net                                                            1,274                             1,424
                                                                                 -----                             -----


    Loss before income taxes                                                  (53,692)                         (11,416)

    Income tax benefit (provision)                                              18,440                           (2,516)
                                                                                ------                            ------


    Net loss                                                                 $(35,252)                        $(13,932)
                                                                              ========                          ========


    Loss per share:

                            Basic                                                 $(0.60)                          $(0.28)

                            Diluted                 $(0.60)                                   $(0.28)


    Shares used to compute loss per share:

                            Basic                                                  58,822                            49,385

                            Diluted                  58,822                                     49,385


                                                                      RIBBON COMMUNICATIONS INC.

                                                                     Consolidated Balance Sheets

                                                                            (in thousands)

                                                                             (unaudited)



                                                                                          December 31,                         December 31,

                                                                                                           2017                                  2016
                                                                                                           ----                                  ----

                                                   Assets

    Current assets:

                        Cash and cash
                        equivalents                                    $57,073                                         $31,923

                        Marketable
                        securities                                      17,224                                          61,836

                        Accounts
                        receivable, net                                165,156                                          53,862

                       Inventory                                        21,303                                          18,283

                        Other current
                        assets                                          21,463                                          12,010
                                                                      ------

                        Total current
                        assets                                         282,219                                         177,914


    Property and equipment, net                                                                       24,780                                11,741

    Intangible assets, net                                                                           244,414                                30,197

    Goodwill                                                                                         335,716                                49,393

    Investments                                                                                        9,031                                32,371

    Deferred income taxes                                                                              8,434                                 1,542

    Other assets                                                                                       6,289                                 4,901

                                                                                                       $910,883                              $308,059
                                                                                                       ========                              ========


                                    Liabilities and Stockholders' Equity

    Current liabilities:

                        Revolving credit
                        facility                                       $20,000                                  $            -

                       Accounts payable                                 45,851                                           6,525

                        Accrued expenses
                        and other                                       76,380                                          27,040

                       Deferred revenue                                100,571                                          43,504
                                                                     -------

                        Total current
                        liabilities                                    242,802                                          77,069


    Long-term debt                                                                                    22,500                                     -

    Deferred revenue, net of current                                                                  14,184                                 7,188

    Deferred income taxes                                                                              2,787                                 3,047

    Other long-term liabilities                                                                       13,189                                 1,633
                                                                                                      ------                                 -----

                                             Total liabilities                                          295,462                                88,937
                                                                                                        -------                                ------


    Commitments and contingencies


    Stockholders' equity:

                       Common stock                                         10                                              49

                        Additional paid-in
                        capital                                      1,684,768                                       1,250,744

                       Accumulated deficit                         (1,072,426)                                    (1,037,174)

                        Accumulated other
                        comprehensive
                        income                                           3,069                                           5,503

                                             Total stockholders' equity                                 615,421                               219,122
                                                                                                        -------                               -------

                                                                                                       $910,883                              $308,059
                                                                                                       ========                              ========


                                                                                                                                     RIBBON COMMUNICATIONS INC.

                                                                                                                                Consolidated Statements of Cash Flows

                                                                                                                                           (in thousands)

                                                                                                                                             (unaudited)



                                                                                                                                                                                           Year ended
                                                                                                                                                                                           ----------

                                                                                                                                                                                          December 31,                                   December 31,

                                                                                                                                                                                                                2017                                          2016
                                                                                                                                                                                                                ----                                          ----

    Cash flows from operating activities:

                             Net loss                                                                                                                                  $(35,252)                                      $(13,932)

                             Adjustments to reconcile net loss to cash flows provided by operating activities:

                             Depreciation and amortization of property and equipment                                                                                                8,486                                          7,970

                             Amortization of intangible assets                                                                                                          17,112                                           7,500

                             Stock-based compensation                                                                                                                   25,657                                          19,768

                             Impairment of intangible assets                                                                                                             5,471                                               -

                             Deferred income taxes                                                                                                                    (20,361)                                          1,088

                             Other                                                                                                                                       (1,340)                                        (1,265)

                             Changes in operating assets and liabilities:

                                               Accounts receivable                                                                                                      (30,759)                                          (851)

                                               Inventory                                                                                                                   5,786                                           4,858

                                               Other operating assets                                                                                                        269                                             506

                                               Accounts payable                                                                                                           13,415                                           (821)

                                               Accrued expenses and other                                                                                                (4,263)                                        (7,778)

                                               Deferred revenue                                                                                                           23,859                                           2,149
                                                                                                                                                                          ------                                           -----

                                                                            Net cash provided by operating activities                                                                                          8,080                                        19,192
                                                                                                                                                                                                               -----                                        ------


    Cash flows from investing activities:

                             Purchases of property and equipment                                                                                                       (3,999)                                        (4,626)

                             Business acquisitions, net of cash acquired                                                                                               (42,951)                                       (20,669)

                             Purchases of marketable securities                                                                                                       (28,731)                                       (78,528)

                             Sale/maturities of marketable securities                                                                                                   96,112                                          75,178

                             Proceeds from the sale of intangible assets                                                                                                    576                                           1,298

                                                                            Net cash provided by (used in) investing activities                                                                               21,007                                      (27,347)
                                                                                                                                                                                                              ------                                       -------


    Cash flows from financing activities:

                             Borrowings under revolving line of credit                                                                                                  15,500                                               -

                             Principal payments on revolving line of credit                                                                                               (13,500)                                              -

                             Principal payments of capital lease obligations                                                                                                   (99)                                           (43)

                             Payment of debt issuance costs                                                                                                              (731)                                              -

                             Proceeds from the sale of common stock in connection with employee purchase plan                                                                                          1,252                                          1,360

                             Proceeds from the exercise of stock options                                                                                                    617                                             153

                              Payment of tax withholding obligations related to net share settlements of
                              restricted stock awards                                                                                                                  (7,523)                                        (1,810)

                             Repurchase of common stock                                                                                                                      -                                        (9,530)

                                                                            Net cash used in financing activities                                                                                            (4,484)                                      (9,870)
                                                                                                                                                                                                              ------                                        ------


    Effect of exchange rate changes on cash and cash equivalents                                                                                                                                             547                                         (163)
                                                                                                                                                                                                             ---                                          ----


    Net increase (decrease) in cash and cash equivalents                                                                                                                                                  25,150                                      (18,188)

    Cash and cash equivalents, beginning of year                                                                                                                                                          31,923                                        50,111
                                                                                                                                                                                                          ------                                        ------

    Cash and cash equivalents, end of year                                                                                                                                                               $57,073                                       $31,923
                                                                                                                                                                                                         =======                                       =======


                                                                                                                                                    RIBBON COMMUNICATIONS INC.

                                                                                                                                                     Supplemental Information

                                                                                                                                                          (in thousands)

                                                                                                                                                            (unaudited)



    The following tables provide the details of stock-based compensation, amortization of intangible assets, impairment of intangible assets, merger integration costs, settlement expense, litigation costs and gain on sales of
     intangible assets included as components of other line items in the Company's Consolidated Statements of Operations and the line items in which these amounts are reported.


                                                                                                                                                                                Three months ended
                                                                                                                                                                                ------------------

                                                                                                                                                                      December 31,                                                September 30,                  December 31,

                                                                                                                                                                                            2017                                                  2017                          2016
                                                                                                                                                                                            ----                                                  ----                          ----

    Stock-based compensation

                         Cost of revenue - product                                                                                               $253                                                                    $75                                $100

                         Cost of revenue - service                                                                                                671                                                                    199                                 329
                                                                                                                                                ---

                         Cost of revenue                                                                                                          924                                                                    274                                 429
                                                                                                                                                  ---                                                                    ---                                 ---


                         Research and development expense                                                                                       3,687                                                                  1,095                               1,327

                         Sales and marketing expense                                                                                            3,195                                                                    871                                 917

                         General and administrative expense                                                                                     6,464                                                                  1,647                               1,631
                                                                                                                                              -----

                         Operating expense                                                                                                     13,346                                                                  3,613                               3,875
                                                                                                                                               ------                                                                  -----                               -----


                                                                  Total stock-based compensation                                                                                         $14,270                                                $3,887                        $4,304
                                                                                                                                                                                         =======                                                ======                        ======



    Amortization of intangible assets

                         Cost of revenue - product                                                                                             $8,119                                                                 $1,601                              $1,501
                                                                                                                                             ------


                         Sales and marketing expense                                                                                            2,148                                                                    692                                 506
                                                                                                                                              -----

                         Operating expense                                                                                                      2,148                                                                    692                                 506
                                                                                                                                                -----                                                                    ---                                 ---


                                                                  Total amortization of intangible assets                                                                                $10,267                                                $2,293                        $2,007
                                                                                                                                                                                         =======                                                ======                        ======



    Impairment of intangible assets

                         Cost of revenue - product                                                                                             $5,471                                               $                      -                           $      -
                                                                                                                                             ======



    Merger integration costs

                         General and administrative expense (A)                                                                                $(178)                                                                  $178                            $      -
                                                                                                                                             ======



    Settlement expense

                         General and administrative expense                                                                                      $300                                                                 $1,600                            $      -
                                                                                                                                               ====



    Litigation costs

                         General and administrative expense                                                                                      $373                                               $                      -                           $      -
                                                                                                                                               ====



    Gain on sales of intangible assets

                         Other income, net                                                                                   $                      -                                              $                      -                               $498
                                                                                                                                  =================



    (A) Amount recorded in Q3 2017 reclassified in Q4 2017 to "Acquisition- and integration-related expense."


                                                                                                               RIBBON COMMUNICATIONS INC.

                                                                                                                Supplemental Information

                                                                                                                     (in thousands)

                                                                                                                       (unaudited)



    The following tables provide the details of stock-based compensation, amortization of intangible assets, impairment of intangible assets, settlement expense, litigation costs
     and gain on the sales of intangible assets included in other line items in the Company's Consolidated Statements of Operations and the line items in which these amounts are
     reported.


                                                                                                                                                                Year ended
                                                                                                                                                                ----------

                                                                                                                                                               December 31,                       December 31,

                                                                                                                                                                                    2017                          2016
                                                                                                                                                                                    ----                          ----

    Stock-based compensation

                      Cost of revenue - product                                                                                           $514                                               $359

                      Cost of revenue - service                                                                                          1,448                                              1,314
                                                                                                                                       -----

                      Cost of revenue                                                                                                    1,962                                              1,673
                                                                                                                                         -----                                              -----


                      Research and development expense                                                                                   7,337                                              5,014

                      Sales and marketing expense                                                                                        4,885                                              6,209

                      General and administrative expense                                                                                11,473                                              6,872
                                                                                                                                      ------

                      Operating expense                                                                                                 23,695                                             18,095
                                                                                                                                        ------                                             ------


                                                           Total stock-based compensation                                                                                        $25,657                       $19,768
                                                                                                                                                                                 =======                       =======



    Amortization of intangible assets

                      Cost of revenue - product                                                                                        $12,887                                             $6,038
                                                                                                                                     -------


                      Sales and marketing expense                                                                                        4,225                                              1,462
                                                                                                                                       -----

                      Operating expense                                                                                                  4,225                                              1,462
                                                                                                                                         -----                                              -----


                                                           Total amortization of intangible assets                                                                               $17,112                        $7,500
                                                                                                                                                                                 =======                        ======



    Impairment of intangible assets

                      Cost of revenue - product                                                                                         $5,471                                           $      -
                                                                                                                                      ======



    Settlement expense

                      General and administrative expense                                                                                $1,900                                               $605
                                                                                                                                      ======



    Litigation costs

                      General and administrative expense                                                                                  $373                                           $      -
                                                                                                                                        ====



    Gain on sales of intangible assets

                      Other income, net                                                                                                   $576                                             $1,298
                                                                                                                                        ====


                                                                                                                              RIBBON COMMUNICATIONS INC.

                                                                                                          Reconciliation of Non-GAAP and GAAP Financial Measures - Historical

                                                                                                                          (in thousands, except percentages)

                                                                                                                                      (unaudited)



                                                                                                                                        Three months ended
                                                                                                                                        ------------------

                                                                                                                                      December 31,                            September 30,          December 31,

                                                                                                                                                             2017                               2017                   2016
                                                                                                                                                             ----                               ----                   ----


    GAAP Product revenue                                                                                                                                  $82,814                            $44,120                $37,662

    Acquisition-related revenue adjustment                                                                                                                  3,230                                  -                     -

    Non-GAAP Product revenue                                                                                                                              $86,044                            $44,120                $37,662
                                                                                                                                                          =======                            =======                =======


    GAAP Service revenue                                                                                                                                  $63,398                            $30,509                $29,910

    Acquisition-related revenue adjustment                                                                                                                 20,050                                  -                     -

    Non-GAAP Service revenue                                                                                                                              $83,448                            $30,509                $29,910
                                                                                                                                                          =======                            =======                =======


    GAAP Total revenue                                                                                                                                   $146,212                            $74,629                $67,572

    Acquisition-related revenue adjustment                                                                                                                 23,280                                  -                     -

    Non-GAAP Total revenue                                                                                                                               $169,492                            $74,629                $67,572
                                                                                                                                                         ========                            =======                =======


    GAAP Gross margin - product                                                                                                                             49.9%                             78.0%                 67.8%

    Acquisition-related revenue adjustment                                                                                                                   1.9%                              0.0%                  0.0%

    Acquisition-related cost of revenue adjustment                                                                                                          -1.4%                              0.0%                  0.0%

    Stock-based compensation                                                                                                                                 0.3%                              0.2%                  0.3%

    Amortization of intangible assets                                                                                                                        9.4%                              3.6%                  3.9%

    Impairment of intangible assets                                                                                                                          6.4%                              0.0%                  0.0%

    Non-GAAP Gross margin - product                                                                                                                         66.5%                             81.8%                 72.0%
                                                                                                                                                             ====                               ====                   ====


    GAAP Gross margin - service                                                                                                                             56.0%                             66.0%                 66.4%

    Acquisition-related revenue adjustment                                                                                                                  10.5%                              0.0%                  0.0%

    Acquisition-related cost of revenue adjustment                                                                                                         -11.0%                              0.0%                  0.0%

    Stock-based compensation                                                                                                                                 0.8%                              0.6%                  1.1%

    Non-GAAP Gross margin - service                                                                                                                         56.3%                             66.6%                 67.5%
                                                                                                                                                             ====                               ====                   ====


    GAAP Total gross margin                                                                                                                                 52.5%                             73.1%                 67.2%

    Acquisition-related revenue adjustment                                                                                                                   6.6%                              0.0%                  0.0%

    Acquisition-related cost of revenue adjustment                                                                                                          -6.1%                              0.0%                  0.0%

    Stock-based compensation                                                                                                                                 0.5%                              0.4%                  0.6%

    Amortization of intangible assets                                                                                                                        4.8%                              2.1%                  2.2%

    Impairment of intangible assets                                                                                                                          3.2%                              0.0%                  0.0%

    Non-GAAP Total gross margin                                                                                                                             61.5%                             75.6%                 70.0%
                                                                                                                                                             ====                               ====                   ====


    GAAP Total gross profit                                                                                                                               $76,799                            $54,547                $45,394

    Acquisition-related revenue adjustment                                                                                                                 23,280                                  -                     -

    Acquisition-related cost of revenue adjustment                                                                                                       (10,364)                                 -                     -

    Stock-based compensation                                                                                                                                  924                                274                    429

    Amortization of intangible assets                                                                                                                       8,119                              1,601                  1,501

    Impairment of intangible asses                                                                                                                          5,471                                  -                     -
                                                                                                                                                            -----                                ---                   ---

    Non-GAAP Total gross profit                                                                                                                          $104,229                            $56,422                $47,324
                                                                                                                                                         ========                            =======                =======


    GAAP Research and development expense                                                                                                                 $40,410                            $20,798                $19,836

    Stock-based compensation                                                                                                                              (3,687)                           (1,095)               (1,327)
                                                                                                                                                           ------                             ------                 ------

    Non-GAAP Research and development expense                                                                                                             $36,723                            $19,703                $18,509
                                                                                                                                                          =======                            =======                =======


    GAAP Sales and marketing expense                                                                                                                      $35,553                            $17,454                $17,649

    Stock-based compensation                                                                                                                              (3,195)                             (871)                 (917)

    Amortization of intangible assets                                                                                                                     (2,148)                             (692)                 (506)
                                                                                                                                                           ------                               ----                   ----

    Non-GAAP Sales and marketing expense                                                                                                                  $30,210                            $15,891                $16,226
                                                                                                                                                          =======                            =======                =======


    GAAP General and administrative expense                                                                                                               $19,649                            $10,833                 $9,292

    Stock-based compensation                                                                                                                              (6,464)                           (1,647)               (1,631)

    Merger integration costs (A)                                                                                                                              178                              (178)                     -

    Settlement expense                                                                                                                                      (300)                           (1,600)                     -

    Litigation costs                                                                                                                                        (373)                                 -                     -
                                                                                                                                                             ----                                ---                   ---

    Non-GAAP General and administrative expense                                                                                                           $12,690                             $7,408                 $7,661
                                                                                                                                                          =======                             ======                 ======


    GAAP Operating expenses                                                                                                                              $112,462                            $50,628                $48,098

    Stock-based compensation                                                                                                                             (13,346)                           (3,613)               (3,875)

    Amortization of intangible assets                                                                                                                     (2,148)                             (692)                 (506)

    Merger integration costs (A)                                                                                                                              178                              (178)                     -

    Settlement expense                                                                                                                                      (300)                           (1,600)                     -

    Litigation costs                                                                                                                                        (373)                                 -                     -

    Acquisition- and integration-related expense                                                                                                          (8,485)                           (1,543)                 (201)

    Restructuring                                                                                                                                         (8,365)                                 -               (1,120)
                                                                                                                                                           ------                                ---                ------

    Non-GAAP Operating expenses                                                                                                                           $79,623                            $43,002                $42,396
                                                                                                                                                          =======                            =======                =======


    GAAP Income (loss) from operations                                                                                                                  $(35,663)                            $3,919               $(2,704)

    Acquisition-related revenue adjustment                                                                                                                 23,280                                  -                     -

    Acquisition-related cost of revenue adjustment                                                                                                       (10,364)                                 -                     -

    Stock-based compensation                                                                                                                               14,270                              3,887                  4,304

    Amortization of intangible assets                                                                                                                      10,267                              2,293                  2,007

    Impairment of intangible assets                                                                                                                         5,471                                  -                     -

    Merger integration costs (A)                                                                                                                            (178)                               178                      -

    Settlement expense                                                                                                                                        300                              1,600                      -

    Litigation costs                                                                                                                                          373                                  -                     -

    Acquisition- and integration-related expense                                                                                                            8,485                              1,543                    201

    Restructuring                                                                                                                                           8,365                                  -                 1,120
                                                                                                                                                            -----                                ---                 -----

    Non-GAAP Income from operations                                                                                                                       $24,606                            $13,420                 $4,928
                                                                                                                                                          =======                            =======                 ======


    (A) Amount recorded in Q3 2017 reclassified in Q4 2017 to "Acquisition- and integration-related expense."


                                                                                                                                  RIBBON COMMUNICATIONS INC.

                                                                                                              Reconciliation of Non-GAAP and GAAP Financial Measures - Historical

                                                                                                                   (in thousands, except percentages and per share amounts)

                                                                                                                                          (unaudited)



                                                                                                                                                                       Three months ended
                                                                                                                                                                       ------------------

                                                                                                                                                                     December 31,                September 30,         December 31,

                                                                                                                                                                                            2017                  2017                   2016
                                                                                                                                                                                            ----                  ----                   ----


    GAAP Income (loss) from operations as a percentage of revenue                                                                                                                         -24.4%                 5.3%                 -4.0%

    Acquisition-related revenue adjustment                                                                                                                                                 17.1%                 0.0%                  0.0%

    Acquisition-related cost of revenue adjustment                                                                                                                                         -6.1%                 0.0%                  0.0%

    Stock-based compensation                                                                                                                                                                8.4%                 5.2%                  6.3%

    Amortization of intangible assets                                                                                                                                                       6.1%                 3.1%                  3.0%

    Impairment of intangible assets                                                                                                                                                         3.2%                 0.0%                  0.0%

    Merger integration costs (A)                                                                                                                                                           -0.1%                 0.2%                  0.0%

    Settlement expense                                                                                                                                                                      0.2%                 2.1%                  0.0%

    Litigation costs                                                                                                                                                                        0.2%                 0.0%                  0.0%

    Acquisition- and integration-related expense                                                                                                                                            5.0%                 2.1%                  0.3%

    Restructuring                                                                                                                                                                           4.9%                 0.0%                  1.7%

    Non-GAAP Income from operations as a percentage of revenue                                                                                                                             14.5%                18.0%                  7.3%
                                                                                                                                                                                            ====                  ====                    ===


    GAAP Other income, net                                                                                                                                                                  $697                    $1                   $508

    Gain on sales of intangible asset                                                                                                                                                          -                    -                 (498)
                                                                                                                                                                                             ---                  ---                  ----

    Non-GAAP Other income, net                                                                                                                                                              $697                    $1                    $10
                                                                                                                                                                                            ====                   ===                    ===


    GAAP Income tax benefit (provision)                                                                                                                                                  $19,761                $(727)                $(614)

    Tax benefits arising from purchase accounting and tax reform                                                                                                                        (21,155)                    -                     -
                                                                                                                                                                                         -------                   ---                   ---

    Non-GAAP Income tax benefit (provision)                                                                                                                                             $(1,394)               $(727)                $(614)
                                                                                                                                                                                         =======                 =====                  =====


    GAAP Net income (loss)                                                                                                                                                             $(15,714)               $3,453               $(2,631)

    Acquisition-related revenue adjustment                                                                                                                                                23,280                     -                     -

    Acquisition-related cost of revenue adjustment                                                                                                                                      (10,364)                    -                     -

    Stock-based compensation                                                                                                                                                              14,270                 3,887                  4,304

    Amortization of intangible assets                                                                                                                                                     10,267                 2,293                  2,007

    Impairment of intangible assets                                                                                                                                                        5,471                     -                     -

    Merger integration costs (A)                                                                                                                                                           (178)                  178                      -

    Settlement expense                                                                                                                                                                       300                 1,600                      -

    Litigation costs                                                                                                                                                                         373                     -                     -

    Acquisition- and integration-related expense                                                                                                                                           8,485                 1,543                    201

    Restructuring                                                                                                                                                                          8,365                     -                 1,120

    Gain on sale of intangible asset                                                                                                                                                           -                    -                 (498)

    Tax benefits arising from purchase accounting and tax reform                                                                                                                        (21,155)                    -                     -
                                                                                                                                                                                         -------                   ---                   ---

    Non-GAAP Net income                                                                                                                                                                  $23,400               $12,954                 $4,503
                                                                                                                                                                                         =======               =======                 ======


    Diluted earnings per share or (loss) per share:

    GAAP Diluted earnings per share or (loss) per share                                                                                                                                  $(0.18)                $0.07                $(0.05)

    Acquisition-related revenue adjustment                                                                                                                                                  0.27                     -                     -

    Acquisition-related cost of revenue adjustment                                                                                                                                        (0.12)                    -                     -

    Stock-based compensation                                                                                                                                                                0.16                  0.08                   0.09

    Amortization of intangible assets                                                                                                                                                       0.12                  0.05                   0.04

    Impairment of intangible assets                                                                                                                                                         0.06                     -                     -

    Merger integration costs (A)                                                                                                                                                               *                    *                     -

    Settlement expense                                                                                                                                                                         *                 0.03                      -

    Litigation costs                                                                                                                                                                           *                    -                     -

    Acquisition- and integration-related expense                                                                                                                                            0.10                  0.03                      *

    Restructuring                                                                                                                                                                           0.10                     -                  0.02

    Gain on sale of intangible asset                                                                                                                                                           -                    -                (0.01)

    Tax benefits arising from purchase accounting and tax reform                                                                                                                          (0.24)                    -                     -
                                                                                                                                                                                           -----                   ---                   ---

    Non-GAAP Diluted earnings per share                                                                                                                                                    $0.27                 $0.26                  $0.09
                                                                                                                                                                                           =====                 =====                  =====


    Shares used to compute diluted earnings per share or (loss) per share:

      GAAP Shares used to compute diluted earnings per share or (loss) per share                                                                                                          86,567                50,131                 49,232

      Non-GAAP Shares used to compute diluted earnings per share                                                                                                                          87,207                50,131                 49,522


    Adjusted EBITDA:

    GAAP Net income (loss)                                                                                                                                                             $(15,714)                3,453                (2,631)

    Interest (income) expense, net                                                                                                                                                           509                 (260)                 (179)

    Income tax (benefit) provision                                                                                                                                                      (19,761)                  727                    614

    Depreciation                                                                                                                                                                           3,231                 1,660                  2,056

    Amortization of intangible assets                                                                                                                                                     10,267                 2,293                  2,007

    Impairment of intangible assets                                                                                                                                                        5,471                     -                     -

    Acquisition-related revenue adjustment                                                                                                                                                23,280                     -                     -

    Acquisition-related cost of revenue adjustment                                                                                                                                      (10,364)                    -                     -

    Stock-based compensation                                                                                                                                                              14,270                 3,887                  4,304

    Merger integration costs (A)                                                                                                                                                           (178)                  178                      -

    Settlement expense                                                                                                                                                                       300                 1,600                      -

    Litigation costs                                                                                                                                                                         373                     -                     -

    Acquisition- and integration-related expense                                                                                                                                           8,485                 1,543                    201

    Restructuring                                                                                                                                                                          8,365                     -                 1,120

    Other (income), net                                                                                                                                                                    (697)                  (1)                 (508)

    Non-GAAP Adjusted EBITDA                                                                                                                                                             $27,837               $15,080                 $6,984
                                                                                                                                                                                         =======               =======                 ======


    *  Less than $0.1 impact on earnings (loss) per share


    (A) Amount recorded in Q3 2017 reclassified in Q4 2017 to "Acquisition- and integration-related expense."


                                              RIBBON COMMUNICATIONS INC.

                         Reconciliation of Non-GAAP and GAAP Financial Measures - Historical

                                          (in thousands, except percentages)

                                                     (unaudited)



                                                      Year ended
                                                      ----------

                                                     December 31,                            December 31,

                                                                    2017                                     2016
                                                                    ----                                     ----


    GAAP Product revenue                                        $181,119                                 $146,381

    Acquisition-related
     revenue adjustment                                            3,230                                        -

    Non-GAAP Product
     revenue                                                    $184,349                                 $146,381
                                                                ========                                 ========


    GAAP Service revenue                                        $148,823                                 $106,210

    Acquisition-related
     revenue adjustment                                           20,050                                        -

    Non-GAAP Service
     revenue                                                    $168,873                                 $106,210
                                                                ========                                 ========


    GAAP Total revenue                                          $329,942                                 $252,591

    Acquisition-related
     revenue adjustment                                           23,280                                        -

    Non-GAAP Total revenue                                      $353,222                                 $252,591
                                                                ========                                 ========


    GAAP Gross margin -
     product                                                       61.2%                                   67.6%

    Acquisition-related
     revenue adjustment                                             0.6%                                    0.0%

    Acquisition-related
     cost of revenue
     adjustment                                                    -0.6%                                    0.0%

    Stock-based
     compensation                                                   0.3%                                    0.2%

    Amortization of
     intangible assets                                              7.0%                                    4.2%

    Impairment of
     intangible assets                                              3.0%                                    0.0%

    Non-GAAP Gross margin
     - product                                                     71.5%                                   72.0%
                                                                    ====                                     ====


    GAAP Gross margin -
     service                                                       60.9%                                   64.6%

    Acquisition-related
     revenue adjustment                                             4.6%                                    0.0%

    Acquisition-related
     cost of revenue
     adjustment                                                    -5.4%                                    0.0%

    Stock-based
     compensation                                                   0.9%                                    1.2%

    Non-GAAP Gross margin
     - service                                                     61.0%                                   65.8%
                                                                    ====                                     ====


    GAAP Total gross
     margin                                                        61.1%                                   66.4%

    Acquisition-related
     revenue adjustment                                             2.6%                                    0.0%

    Acquisition-related
     cost of revenue
     adjustment                                                    -2.9%                                    0.0%

    Stock-based
     compensation                                                   0.6%                                    0.7%

    Amortization of
     intangible assets                                              3.6%                                    2.3%

    Impairment of
     intangible assets                                              1.5%                                    0.0%

    Non-GAAP Total gross
     margin                                                        66.5%                                   69.4%
                                                                    ====                                     ====


    GAAP Total gross
     profit                                                     $201,496                                 $167,611

    Acquisition-related
     revenue adjustment                                           23,280                                        -

    Acquisition-related
     cost of revenue
     adjustment                                                 (10,364)                                       -

    Stock-based
     compensation                                                  1,962                                    1,673

    Amortization of
     intangible assets                                            12,887                                    6,038

    Impairment of
     intangible asses                                              5,471                                        -
                                                                   -----                                      ---

    Non-GAAP Total gross
     profit                                                     $234,732                                 $175,322
                                                                ========                                 ========


    GAAP Research and
     development expense                                        $101,481                                  $72,841

    Stock-based
     compensation                                                (7,337)                                 (5,014)
                                                                  ------                                   ------

    Non-GAAP Research and
     development expense                                         $94,144                                  $67,827
                                                                 =======                                  =======


    GAAP Sales and
     marketing expense                                           $83,403                                  $68,539

    Stock-based
     compensation                                                (4,885)                                 (6,209)

    Amortization of
     intangible assets                                           (4,225)                                 (1,462)
                                                                  ------                                   ------

    Non-GAAP Sales and
     marketing expense                                           $74,293                                  $60,868
                                                                 =======                                  =======


    GAAP General and
     administrative
     expense                                                     $47,642                                  $35,948

    Stock-based
     compensation                                               (11,473)                                 (6,872)

    Settlement expense                                           (1,900)                                   (605)

    Litigation costs                                               (373)                                       -
                                                                    ----                                      ---

    Non-GAAP General and
     administrative
     expense                                                     $33,896                                  $28,471
                                                                 =======                                  =======


    GAAP Operating
     expenses                                                   $256,725                                 $181,220

    Stock-based
     compensation                                               (23,695)                                (18,095)

    Amortization of
     intangible assets                                           (4,225)                                 (1,462)

    Settlement expense                                           (1,900)                                   (605)

    Litigation costs                                               (373)                                       -

    Acquisition- and
     integration-related
     expense                                                    (14,763)                                 (1,152)

    Restructuring                                                (9,436)                                 (2,740)
                                                                  ------                                   ------

    Non-GAAP Operating
     expenses                                                   $202,333                                 $157,166
                                                                ========                                 ========


    GAAP Loss from
     operations                                                $(55,229)                               $(13,609)

    Acquisition-related
     revenue adjustment                                           23,280                                        -

    Acquisition-related
     cost of revenue
     adjustment                                                 (10,364)                                       -

    Stock-based
     compensation                                                 25,657                                   19,768

    Amortization of
     intangible assets                                            17,112                                    7,500

    Impairment of
     intangible assets                                             5,471                                        -

    Settlement expense                                             1,900                                      605

    Litigation costs                                                 373                                        -

    Acquisition- and
     integration-related
     expense                                                      14,763                                    1,152

    Restructuring                                                  9,436                                    2,740
                                                                   -----                                    -----

    Non-GAAP Income from
     operations                                                  $32,399                                  $18,156
                                                                 =======                                  =======


                                                                                                       RIBBON COMMUNICATIONS INC.

                                                                                   Reconciliation of Non-GAAP and GAAP Financial Measures - Historical

                                                                                        (in thousands, except percentages and per share amounts)

                                                                                                               (unaudited)



                                                                                                                                                        Year ended
                                                                                                                                                        ----------

                                                                                                                                                       December 31,           December 31,

                                                                                                                                                                         2017                    2016
                                                                                                                                                                         ----                    ----


    GAAP Loss from operations as a percentage of revenue                                                                                                               -16.7%                  -5.4%

    Acquisition-related revenue adjustment                                                                                                                               7.7%                   0.0%

    Acquisition-related cost of revenue adjustment                                                                                                                      -2.9%                   0.0%

    Stock-based compensation                                                                                                                                             7.3%                   7.8%

    Amortization of intangible assets                                                                                                                                    4.8%                   3.0%

    Impairment of intangible assets                                                                                                                                      1.5%                   0.0%

    Settlement expense                                                                                                                                                   0.5%                   0.2%

    Litigation costs                                                                                                                                                     0.1%                   0.0%

    Acquisition- and integration-related expense                                                                                                                         4.2%                   0.5%

    Restructuring                                                                                                                                                        2.7%                   1.1%

    Non-GAAP Income from operations as a percentage of revenue                                                                                                           9.2%                   7.2%
                                                                                                                                                                          ===                     ===


    GAAP Other income, net                                                                                                                                             $1,274                  $1,424

    Gain on sales of intangible assets                                                                                                                                  (576)                (1,298)
                                                                                                                                                                         ----                  ------

    Non-GAAP Other income, net                                                                                                                                           $698                    $126
                                                                                                                                                                         ====                    ====


    GAAP Income tax benefit (provision)                                                                                                                               $18,440                $(2,516)

    Tax benefits arising from purchase accounting and tax reform                                                                                                     (21,155)                      -
                                                                                                                                                                      -------                     ---

    Non-GAAP Income tax provision                                                                                                                                    $(2,715)               $(2,516)
                                                                                                                                                                      =======                 =======


    GAAP Net loss                                                                                                                                                   $(35,252)              $(13,932)

    Acquisition-related revenue adjustment                                                                                                                             23,280                       -

    Acquisition-related cost of revenue adjustment                                                                                                                   (10,364)                      -

    Stock-based compensation                                                                                                                                           25,657                  19,768

    Amortization of intangible assets                                                                                                                                  17,112                   7,500

    Impairment of intangible assets                                                                                                                                     5,471                       -

    Settlement expense                                                                                                                                                  1,900                     605

    Litigation costs                                                                                                                                                      373                       -

    Acquisition- and integration-related expense                                                                                                                       14,763                   1,152

    Restructuring                                                                                                                                                       9,436                   2,740

    Gain on sales of intangible assets                                                                                                                                  (576)                (1,298)

    Tax benefits arising from purchase accounting and tax reform                                                                                                     (21,155)
                                                                                                                                                                      -------

    Non-GAAP Net income                                                                                                                                               $30,645                 $16,535
                                                                                                                                                                      =======                 =======


    Diluted earnings per share or (loss) per share:

    GAAP Loss per share                                                                                                                                               $(0.60)                $(0.28)

    Acquisition-related revenue adjustment                                                                                                                               0.38                       -

    Acquisition-related cost of revenue adjustment                                                                                                                     (0.17)                      -

    Stock-based compensation                                                                                                                                             0.43                    0.40

    Amortization of intangible assets                                                                                                                                    0.29                    0.15

    Impairment of intangible assets                                                                                                                                      0.09                       -

    Settlement expense                                                                                                                                                   0.03                    0.01

    Litigation costs                                                                                                                                                     0.01                       -

    Acquisition- and integration-related expense                                                                                                                         0.25                    0.02

    Restructuring                                                                                                                                                        0.16                    0.06

    Gain on sales of intangible assets                                                                                                                                 (0.01)                 (0.03)

    Tax benefits arising from purchase accounting and tax reform                                                                                                       (0.35)                      -
                                                                                                                                                                        -----                     ---

    Non-GAAP Diluted earnings per share                                                                                                                                 $0.51                   $0.33
                                                                                                                                                                        =====                   =====


    Shares used to compute diluted earnings per share or (loss) per share:

      GAAP Shares used to compute loss per share                                                                                                                       58,822                  49,385

      Non-GAAP Shares used to compute diluted earnings per share                                                                                                       59,639                  49,743


    Adjusted EBITDA:

    GAAP Net loss                                                                                                                                                   $(35,252)              $(13,932)

    Interest (income), net                                                                                                                                              (263)                  (769)

    Income tax (benefit) provision                                                                                                                                   (18,440)                  2,516

    Depreciation                                                                                                                                                        8,486                   7,970

    Amortization of intangible assets                                                                                                                                  17,112                   7,500

    Impairment of intangible assets                                                                                                                                     5,471                       -

    Adjustment for revenue reduction resulting from purchase accounting allocation                                                                                     23,280                       -

    Adjustment to cost related to revenue adjustment                                                                                                                 (10,364)                      -

    Stock-based compensation                                                                                                                                           25,657                  19,768

    Settlement expense                                                                                                                                                  1,900                     605

    Litigation costs                                                                                                                                                      373                       -

    Acquisition- and integration-related expense                                                                                                                       14,763                   1,152

    Restructuring                                                                                                                                                       9,436                   2,740

    Other (income), net                                                                                                                                               (1,274)                (1,424)

    Non-GAAP Adjusted EBITDA                                                                                                                                          $40,885                 $26,126
                                                                                                                                                                      =======                 =======


                                                                                                         RIBBON COMMUNICATIONS INC.

                                                                                      Reconciliation of Non-GAAP and GAAP Financial Measures - Guidance

                                                                                                                (in millions)

                                                                                                                 (unaudited)



                                                                                                                                                                                       Year

                                                                                                                                                                                      ending

                                                                                                                                                                                   December 31,

                                                                                                                                                                                                         2018
                                                                                                                                                                                                         ----


    Non-GAAP Revenue                                                                                                                                                                                     $580

    Less acquisition-related adjustments and impact of new revenue standard                                                                                                                              (32)

    GAAP Revenue                                                                                                                                                                                         $548
                                                                                                                                                                                                         ====



    Adjusted EBITDA: Ribbon has not provided a reconciliation of Adjusted EBITDA for the year ending December 31, 2018, as it is unable to project without unreasonable efforts the comparable GAAP net loss
     figure, which includes interest expense, net; income tax provision; depreciation; amortization of intangible assets; acquisition-related revenue and related cost of revenue adjustments; adjustment for the
     impact of the new revenue standard; stock-based compensation; litigation costs; acquisition- and integration-related expense; restructuring; and other income (expense), net.

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