Twenty-Eight-Year Sales and Marketing Veteran Brings Expertise in Go-to-Market and Channel Enablement

WESTFORD, Mass., May 3, 2011 – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in next-generation IP-based network solutions, today announced the appointment of industry veteran Todd Abbott as its Senior Vice President of Worldwide Sales. Todd joins Sonus from his most recent role at Avaya, where he was the Senior Vice President of Sales and Marketing. In that role, Todd was instrumental in implementing their go-to-market strategy and their transition from a principally direct approach to one that includes channel partnerships. He was also an integral member of the acquisition and integration team responsible for the purchase of the Nortel Enterprise business. Prior to that, Todd successfully built and led sales teams at Symbol, Cisco and IBM.

"I am pleased to welcome Todd to lead our sales efforts at Sonus," said Ray Dolan, President and CEO of Sonus. "The credibility and leadership experience Todd brings to the team should help us drive greater execution levels and increase our sales velocity. In addition, as we ramp up our channel development efforts, Todd's relationships and expertise in that area should help us to accelerate the pace of business we transact through partners."

Mr. Abbott will report directly to the CEO. His role will involve responsibility for the global sales force, including the responsibility for Sonus's channel partnerships. Commenting on his appointment, Mr. Abbott said, "I am truly excited to be here. Sonus has a well-regarded customer base and has trusted relationships with its customers. It is also a company that has shown great technology innovation in the past year. As it expands its presence into new market segments and gains increased traction through partners, I look forward to leveraging my experience and contributing to our success together as a team."

Todd Abbott received his Bachelor's degree in Finance and Marketing from Northeastern University in Boston, Massachusetts in 1982 and started his sales career at IBM. From there, he moved on to various sales leadership positions at Cisco, Symbol, Seagate and Avaya. In addition to his international experience, including Asia and Europe, Todd has led broad transformations in multiple organizations from primarily direct sales approaches to ones that included channel partnerships. In his most recent position at Avaya, he also led the acquisition of the Nortel Enterprise business, and integrated over 1300 sales associates and 3000 channel partners.

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 .

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:

Sonus Networks:
Aline Kaplan
alkaplan@sonusnet.com
+1 978-614-8167

Paul Roberts
sonus@daviesmurphy.com
+1 781-418-2418