Sonus Networks to Present at Upcoming Technology Conference - Barclays Global Communications, Media and Technology Conference

WESTFORD, Mass., May 23, 2011 /PRNewswire/ – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in next generation IP-based network solutions, today announced that Raymond P. Dolan, the Company's President and Chief Executive Officer, is scheduled to present at the Barclays Global Communications, Media and Technology Conference in New York on Wednesday, May 25, 2011. The presentation will be webcast live beginning at approximately 11:15 a.m. Eastern Time. All interested parties can access the webcast live on the Company's investor relations website at http://www.investors.sonusnet.com/events.cfm. The webcast will be archived on the Company's website for fourteen days following the presentation.

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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. Visit http://www.investors.sonusnet.com/ for more information about Sonus Networks.

Important Information Regarding Forward-Looking Statements

This release may contain forward-looking statements 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 and all subsequent Quarterly Reports on Form 10-Q, which identify 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:

Wayne Pastore
978-614-8291
wpastore@sonusnet.com

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

SOURCE Sonus Networks, Inc.