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•	Full redundancy, designed for 5-nine's (99.999%) availability;

•	Quality of service equal or superior to the PSTN;

•	System hardware designed to comply with Network Equipment Building System (NEBS) standards Level 3;

•	Interworking between numerous signaling and media formats to support multivendor, global networks;

•	Sophisticated security, network monitoring and analytics capabilities; and

•	Multi-tenant, geo-redundant voice applications.

•	SS7 and other telephony signaling protocols, including numerous country variants, number translations (e.g., ENUM, DNS) and intelligent services routing;

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•	Call signaling standards such as SIP and its variants: BICC, MGCP, H.323 and Diameter;

•	Narrowband and Wideband media encoding/decoding formats and standards such as G.711 and G.722;

•	All bearer interfaces over both packet- and circuit-based bearers such as TDM, Optical and Ethernet;

•	Management and accounting interfaces such as Radius, Diameter, SNMP and AMA; and

•	Interoperability with enterprise systems including Private Branch eXchanges (PBXs), IVR applications and Microsoft Lync Server.

•	Sonus SBC 1000 Session Border Controller for small businesses, branch offices and small Points of Presence (PoPs) that require performance of up to 100 concurrent SIP sessions in a standalone SBC;

•	Sonus SBC 2000 Session Border Controller for midsize enterprises and regional PoPs that require performance of up to 600 concurrent SIP sessions in a standalone SBC;

•	Sonus SBC 5100 Session Border Controller for larger enterprises and service providers that require performance of up to 10,000 concurrent SIP sessions in a standalone SBC;

•	Sonus SBC 5200 Session Border Controller for Fortune 500 enterprises and large national/global service providers that require performance of up to 64,000 concurrent SIP sessions in a standalone SBC;

•	Sonus SBC 9000 Session Border Controller for large enterprises and service providers that require a hybrid gateway/SBC solution for a mix of TDM and IP voice traffic; and,

•	Sonus VX Session Border Controller hybrid gateway/SBC solutions for a mix of TDM and IP voice traffic.

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•	Sonus NetScore network performance analysis tool, which provides a real-time assessment of the state of a service provider's or enterprise's network, including quality of service, call delay, network effectiveness, congestion and efficiency;

•	Sonus NetEng network audit and visualization tool, which provides visibility into the performance and capacity levels of Sonus IP networks by collecting, analyzing and aggregating historical data from each Sonus network element and presenting the information through visual reports;

•	Sonus Element Management System for centralized management and provisioning of Sonus network elements;

•	Sonus DataStream Integrator for integration of call detail records with back-office billing and accounting systems;

•	Sonus Trunk Group Activator for simplified, automated provisioning of SIP trunk groups in Sonus IP networks; and

•	Sonus Insight Customer Portal for web-based self-provisioning of voice subscriber services.

•	A full-service portfolio including consulting, integration, deployment, migration and operation support services;

•	Global reach through our worldwide service organization and partner presence in all major global markets;

•	Program managers who use a disciplined methodology for all deployment and integration projects; and

•	Consistent execution in the design, deployment and support of the world's largest and most advanced networks.

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•	Protecting the source and object code for our software, documentation and other written materials under copyright laws and trade secret;

•	Licensing our software pursuant to signed license agreements, which impose restrictions on others' ability to use our software; and

•	Seeking to limit disclosure of our intellectual property by requiring employees and consultants with access to our proprietary information to execute confidentiality agreements.

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•	consolidation within the telecommunications industry, including acquisitions of or by our customers;

•	general economic conditions in our markets, both domestic and international, as well as the level of discretionary IT spending;

•	competitive conditions in our markets, including the effects of new entrants, consolidation, technological innovation and substantial price discounting;

•	fluctuation in demand for our voice infrastructure products and services, and the timing and size of customer orders;

•	fluctuations in foreign exchange rates;

•	cancellation or deferral of existing customer orders or the renegotiation of existing contractual commitments;

•	mix of product configurations sold;

•	length and variability of the sales cycle for our products;

•	application of complex revenue recognition accounting rules to our customer arrangements;

•	timing of revenue recognition;

•	changes in our pricing policies, the pricing policies of our competitors and the prices of the components of our products;

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•	market acceptance of new products, product enhancements and services that we offer;

•	the quality and level of our execution of our business strategy and operating plan, and the effectiveness of our sales and marketing programs;

•	new product announcements, introductions and enhancements by us or our competitors, which could result in deferrals of customer orders;

•	our ability to develop, introduce, ship and successfully deliver new products and product enhancements that meet customer requirements in a timely manner;

•	our reliance on contract manufacturers for the production and shipment of our hardware products;

•	our or our contract manufacturers' ability to obtain sufficient supplies of sole or limited source components or materials;

•	our ability to attain and maintain production volumes and quality levels for our products;

•	variability and unpredictability in the rate of growth in the markets in which we compete;

•	costs related to acquisitions; and

•	corporate restructurings.

•	economic conditions that discourage potential new customers from making the capital investments required to adopt new technologies;

•	deterioration in the general financial condition of service providers and enterprises, or their ability to raise capital or access lending sources; and

•	new product introductions by our competitors.

•	customer willingness to implement our new voice infrastructure products;

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•	acquisitions of or by our customers;

•	delays or difficulties that we may incur in completing the development and introduction of our planned products or product enhancements;

•	failure of our products to perform as expected; and

•	difficulties we may incur in meeting customers' delivery requirements.

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•	loss of key employees;

•	diversion of management's attention from normal daily operations of the business;

•	diminished ability to respond to customer requirements related to both products and services;

•	decrease in cash and profits related to severance payments and facility termination costs;

•	disruption of our engineering and manufacturing processes, which could adversely affect our ability to introduce new products and to deliver products both on a timely basis and in accordance with the highest quality standards; and/or

•	reduced ability to execute effectively internal administrative processes, including the implementation of key information technology programs.

•	problems or delays in assimilating or transitioning to Sonus the acquired operations, systems, processes, controls, technologies, products or personnel;

•	loss of acquired customer accounts;

•	unanticipated costs associated with the acquisition;

•

failure to identify in the due diligence process or assess the magnitude of certain liabilities we are assuming in the acquisition, which could result in unexpected litigation or regulatory exposure, unfavorable accounting treatment, unexpected increases in taxes due, a loss of anticipated tax benefits, significant issues with product quality or development, or other adverse effects on our business, operating results or financial condition;

•	multiple or overlapping product lines as a result of our acquisitions that are offered, priced and supported differently, which could cause customer confusion and delays;

•	higher than anticipated costs in continuing support and development of acquired products;

•	diversion of management's attention from our core business and the challenges of managing larger and more widespread operations resulting from the acquisition;

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•	adverse effects on existing business relationships of Sonus or NET with the respective suppliers, licensors, contract manufacturers, customers, distributors, resellers and industry experts;

•	significant impairment, exit and/or restructuring charges if the products or technologies acquired in the acquisition do not meet our sales expectations or are unsuccessful;

•	insufficient revenue to offset increased expenses associated with the acquisition;

•	risks associated with entering markets in which we have no or limited prior experience;

•	potential loss of NET's or our own employees; and/or

•	failure to properly integrate internal controls and financial systems of the combined companies.

•	issue stock that would dilute existing stockholders' percentage ownership;

•	incur debt or assume liabilities;

•	reduce significantly our cash and investments;

•	incur significant impairment charges related to the write-off of goodwill and intangible assets;

•	incur significant amortization expenses related to intangible assets; and/or

•	incur large and immediate write-offs for in-process research and development and stock-based compensation.

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•	reduced demand for our products as a result of our customers choosing to refrain from building capital intensive networks;

•	increased price competition for our products, not only from our competitors, but also as a consequence of customers disposing of unutilized products;

•	risk of excess and obsolete inventories;

•	excess facilities and manufacturing capacity; and/or

•	higher overhead costs as a percentage of revenue and higher interest expense.

•	provide extremely high reliability and quality;

•	deploy and scale easily and efficiently;

•	interoperate with existing network infrastructures and multivendor solutions;

•	provide effective network management;

•	are accompanied by comprehensive customer support and professional services;

•	provide a cost-effective and space efficient solution for service providers; and

•	meet price competition from low cost equipment providers.

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•	addition or loss of any major customer;

•	continued significant declines in customer spending in the media gateway trunking business;

•	consolidation and competition in the telecommunications industry;

•	changes in the financial condition or anticipated capital expenditure purchases of any existing or potential major customer;

•	economic conditions for the telecommunications, networking and related industries;

•	quarterly variations in our bookings, revenues and operating results;

•	changes in financial estimates by securities analysts;

•	speculation in the press or investment community;

•	announcements by us or our competitors of significant contracts, new products or acquisitions, distribution partnerships, joint ventures or capital commitments;

•	activism by any single large stockholder or combination of stockholders;

•	sales of common stock or other securities by us or by our stockholders in the future;

•	securities and other litigation;

•	announcement of a stock split, reverse stock split, stock dividend or similar event; and/or

•	emergence or adoption of new technologies or industry standards.

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•	stop selling, incorporating or using our products that use the challenged intellectual property;

•	obtain from the owner of the infringed intellectual property right a license to sell or use the relevant technology, which license may not be available at acceptable prices, on acceptable terms, or at all; or

•	redesign those products that use any allegedly infringing technology.

•	authorizing the Board of Directors to issue shares of preferred stock;

•	limiting the persons who may call special meetings of stockholders;

•	prohibiting stockholder actions by written consent;

•	permitting the Board of Directors to increase the size of the Board and to fill vacancies;

•	providing indemnification to our directors and officers;

•	controlling the procedures for conduct and scheduling of Board and stockholder meetings;

•	requiring a super-majority vote of our stockholders to amend our amended and restated by-laws and certain provisions of our amended and restated certificate of incorporation; and

•	establishing advance notice requirements for nominations for election to the Board of Directors or for proposing matters that can be acted on by stockholders at stockholder meetings.

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•	reliance on channel partners;

•	greater difficulty collecting accounts receivable and longer collection cycles;

•	difficulties and costs of staffing and managing international operations;

•	impacts of differing technical standards outside the United States;

•	compliance with international trade, customs and export control regulations;

•	reduced protection for intellectual property rights in some countries;

•	foreign government regulations limiting or prohibiting potential sales or increasing the cost of doing business in such markets, including reversals or delays in the opening of foreign markets to new competitors or the introduction of new technologies;

•	challenging pricing environments in highly competitive new markets;

•	foreign currency exchange controls, restrictions on repatriation of cash and changes in currency exchange rates;

•	potentially adverse tax consequences; and

•	political, social and economic instability, including as a result of the current fragility of global financial markets, concerns regarding European sovereign debt, health pandemics or epidemics and/or acts of war or terrorism.

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•	loss of, or delay in, revenues or increased expense;

•	loss of customers and market share;

•	failure to attract new customers or achieve market acceptance for our products;

•	increased service, support and warranty costs and a diversion of development resources; and/or

•	costly and time-consuming legal actions by our customers.

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•	loss of customers and market share;

•	failure to attract new customers in new geographies;

•	increased service, support and warranty costs and a diversion of development resources; and/or

•	network performance penalties.

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•	loss of, or delay in, revenues;

•	increased service, support and warranty costs and a diversion of development resources; and

•	network performance penalties.

•	loss of customers and market share; and

•	failure to attract new customers or achieve market acceptance for our products.

•	difficulty hiring and retaining appropriate engineering and management resources due to intense competition for such resources and resulting wage inflation;

•	knowledge transfer related to our technology and resulting exposure to misappropriation of intellectual property or information that is proprietary to us, our customers and other third parties;

•	heightened exposure to changes in economic, security and political conditions in India; and

•	fluctuations in currency exchange rates and tax compliance in India.

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(1)	Includes the results of operations of Network Equipment Technologies, Inc. for the period subsequent to its acquisition by the Company on August 24, 2012.

(2)	Includes the results of operations of Atreus Systems, Inc. for the period subsequent to its acquisition by the Company on April 18, 2008 and $88.4 million of income tax expense related to the recording of a valuation allowance on certain deferred tax assets.

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•	expanding our solutions to address emerging Unified Communication and IP-based markets, such as SBC, in the enterprise and service provider markets;

•	embracing the principles outlined by 3GPP, 4GPP2 and LTE architectures and delivering the industry's most advanced IMS (IP Multimedia Subsystem)-ready SBC product suite;

•	leveraging our TDM (time division multiplexing)-to-IP gateway technology leadership with service providers to accelerate adoption of SIP-enabled Unified Communication services;

•	expanding and broadening our customer base by targeting the enterprise for SIP trunking and access solutions;

•	assisting our customers' ability to differentiate themselves by offering a sophisticated application development platform and service creation environment;

•	expanding our global sales distribution, marketing and support capabilities;

•	actively contributing to the SIP standards definition and adoption process; and

•	pursuing strategic transactions and alliances.

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•	Revenue recognition;

•	Valuation of inventory;

•	Loss contingencies and reserves;

•	Stock-based compensation;

•	Business combinations;

•	Goodwill and intangible assets; and

•	Accounting for income taxes.

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*	The restructuring payments for facilities are included as a component of the Operating lease obligations in the table above.

**	This liability is not subject to fixed payment terms and the amount and timing of payments, if any, which we will make related to this liability are not known. See Note 17 to our consolidated financial statements appearing in this Annual Report on Form 10-K for additional information.

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*	Represents less than 10% of revenue

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(1)	Includes the results of NET for the period subsequent to August 24, 2012.

(2)	Earnings (loss) per share is calculated independently for each of the quarters presented; accordingly, the sum of the quarterly earnings (loss) per share amounts may not equal the total calculated for the year.

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*	Filed herewith.

+	Management contract or compensatory plan or arrangement filed in response to Item 15(a)(3) of the Instructions to the Annual Report on Form 10-K.

**	Pursuant to Rule 406T of Regulation S-T, these interactive data files are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933 or Section 17 of the Securities Exchange Act of 1934 and otherwise are not subject to liability.

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2.	Vesting.

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1.	I have reviewed this Annual Report on Form 10-K of Sonus Networks, Inc.;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.	The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)	Designed such internal control over financial reporting or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)	Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)	Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.	The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing equivalent functions):

(a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

1.	I have reviewed this Annual Report on Form 10-K of Sonus Networks, Inc.;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.	The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)	Designed such internal control over financial reporting or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)	Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)	Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.	The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing equivalent functions):

(a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

(1)	the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)	the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

(1)	the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)	the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.