[April 30, 2012]

Sonus Networks to Participate in Upcoming Investment Conferences

Sonus Networks, Inc. (Nasdaq: SONS), a global leader in SIP communications, today announced that it will participate in the following investment conferences in May:

• Ray Dolan, Chief Executive Officer, and Moe Castonguay, Chief Financial Officer, will present at the Jefferies 2012 Global Technology Media & Telecom Conference in New York City on Monday, May 7, 2012 at 3:45 pm EDT.
• Moe Castonguay, Chief Financial Officer, will present at the 11th Annual JMP Securities (News - Alert) Research Conference in San Francisco on Wednesday, May 15, 2012 at 3:30 pm PDT.

Interested parties can access the webcasts live on Sonus Networks (News - Alert) website at http://investors.sonusnet.com/events.cfm. The presentations will be available for replay for 60 days following the presentation date.

Tags:

Sonus Networks, Sonus, SONS, investor, investment, conferences, presentation, IP-based network solutions, SBC, SBC 5200, SBC 9000, session border controller, session border control, session management, SIP trunking, Cloud VoIP communications, unified communications, UC, VoIP, IP, TDM.

About Sonus Networks

Sonus Networks, Inc. is a leader in IP networking with proven expertise in delivering secure, reliable and scalable next-generation infrastructure and subscriber solutions. With customers in over 50 contries across the globe and over a decade of experience in transforming networks to IP, Sonus has enabled service providers and enterprises to capture and retain users and generate significant ROI. Sonus products include session border controllers, policy/routing servers, subscriber feature servers and media and signaling gateways. Sonus products are supported by a global services team with experience in design, deployment and maintenance of some of the world's largest and most complex IP networks. For more information, visit www.sonus.net.

Important Information Regarding Forward-Looking Statements

The information in this release may contain certain forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995 regarding future events that involve risks and uncertainties.

Although the company believes that its expectations are based on reasonable assumptions, readers are cautioned that these forward-looking statements are only predictions and are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Our actual results may differ materially from those contemplated by the forward-looking statements. Such forward-looking statements may relate to, among others, expected growth rates, future business prospects and market conditions. Such forward-looking statements do not constitute guarantees of future performance and are subject to a variety of risks and uncertainties that could cause actual results to differ materially from those anticipated. These include, but are not limited to: the timing of the Company's recognition of revenues; the ability to recruit and retain key personnel; difficulties supporting our new strategic focus on channel sales; difficulties expanding the Company's customer base; difficulties leveraging market opportunities; difficulties providing solutions that meet the needs of customers; market acceptance of the Company's products and services; rapid technological and market change; the ability to protect intellectual property rights; the ability to maintain partner, reseller, distribution and vendor support and supply relationships; higher risks in international operations and markets; the ability to hire and retain employees; the impact of increased competition; currency fluctuations; litigation; changes in the market prices of the Company's common stock; actions taken by significant stockholders; failure or circumvention of the Company's controls and procedures and other risks and uncertainties described more fully in documents filed with or furnished to the Securities and Exchange Commission by the Company, including in Part I, Item 1A "Risk Factors", and Part II, Item 7 and Item 7A "Management's Discussion and Analysis of Financial Condition and Results of Operations", and "Quantitative and Qualitative Disclosure about Market Risk" in the Company's most recent Annual Report on Form 10-K, and in Part I, Items 2 and 3 "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Quantitative and Qualitative Disclosures About Market Risk", and Part II, Item 1A, "Risk Factors", in the company's quarterly reports filed thereafter.

Any forward-looking statements represent Sonus' views only as of the date on which such statement is made, and should not be relied upon as representing Sonus' views as of any subsequent date. While Sonus may elect to update forward-looking statements at some point, Sonus specifically disclaims any obligation to do so, except as required by law.

Sonus is a registered trademark of Sonus Networks, Inc. All other company and product names may be trademarks of the respective companies with which they are associated.

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