Sonus Networks Schedules Conference Call For First Quarter 2011 Financial Results.

WESTFORD, Mass., April 13, 2011 /PRNewswire/ -- 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 first quarter of 2011 after the close of the market on Tuesday, May 3, 2011, and will host a conference call with financial analysts and investors at 4:45 p.m. ET that day.

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Conference Call Details: Date: Tuesday, May 3, 2011 Time: 4:45 p.m. ET

To listen live via telephone: Dial-in number: 800-926-9175 International Callers: +1 212-231-2910

To listen via internet: Sonus will host a live webcast of the conference call. To access the webcast, visit www.sonusnet.com, About Us, Investor Relations.

Replay Information:

A telephone playback of the call will be available following the conference and can be accessed by calling 800-633-8284 or, for international callers, +1-402-977-9140. The reservation number for the replay is 21519789 and will be available until May 17, 2011.

A replay of the webcast will be also available on the Sonus Networks Investor Relations website. To access the replay of the webcast, visit www.sonusnet.com, About Us, Investor Relations, Webcast Archive.

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 media and signaling gateways, policy/routing servers, session border controllers and subscriber feature servers. 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.

Important Information Regarding Forward-Looking Statements

This release may contain forward-looking statements (within the meaning of the Private Securities Litigation Reform Act) regarding future events that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. Readers are referred to Item 1A "Risk Factors" of Sonus' Annual Report on Form 10-K for the year ended December 31, 2010, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. Any forward-looking statements represent Sonus' views only as of today 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.

For more information, please contact:

Fran Murphy 978-614-8148 fmurphy@sonusnet.com

SOURCE Sonus Networks, Inc.