Sonus Networks Announces the Date of Its Conference Call and Webcast to Report Fourth Quarter and Full Year 2011 Financial Results

Sonus Networks, Inc. (Nasdaq: SONS), a market leader in next-generation IP-based network solutions, today announced that it will release financial results for the fourth quarter and full year 2011 after the close of the market on Tuesday, Feb. 21, 2012. The company will also provide its business outlook for the first quarter of 2012. Following the release, Sonus Networks will host a conference call with the financial community at 4:45 p.m. EST to discuss the results. The company will offer a live, audio webcast of the conference call via the Sonus Networks Investor website at http://investors.sonusnet.com/events.

Conference call details:
Date: February 21, 2012
Time: 4:45 p.m. EST
Dial-in number: 800 954 0654
International Callers: +1 212 231 2900

Replay information:

A telephone playback of the call will be available following the conference call until March 6, 2012, and can be accessed by calling 800 633 8284, or +1 402 977 9140 for international callers. The reservation number for the replay is 21573853.

An archived version of the broadcast will also be available on the Sonus Networks Investor Relations website shortly after the conclusion of the live event. To access the replay of the webcast, visit http://investors.sonusnet.com/events.

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 countries 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.sonusnet.com and the Sonus in Session blog.

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.

Important factors that could cause actual results to differ materially from those in the forward-looking statements are discussed by reference to the factors described 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.