Leading technologist to be responsible for technology vision and advanced product direction; Company's Founder Mike Hluchyj to Retire from Sonus Networks

WESTFORD, Mass., January 16, 2007 - Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced that Dr. Vikram Saksena has been appointed Chief Technology Officer (CTO) for Sonus Networks. Dr. Saksena was previously Sonus' chief scientist. In this expanded role, he will be responsible for Sonus' overall technology direction, as well as leading Sonus' advanced development initiatives. Additionally, the Company announced that its founder Mike Hluchyj has retired from Sonus Networks.

“As part of the Sonus team, Vikram has played an active role in driving the future of Sonus' technology innovation helping to advance our wireless and application initiatives. His technical background, experience and passion for delivering value to customers will enable Sonus to extend its leadership as the market continues to develop for next-generation communications,” said Hassan Ahmed, chairman and CEO, Sonus Networks. “Thanks to Mike's vision and commitment over the last 9 years, Sonus has grown into a clear leader in next-generation communications and is a company that continues to set the bar in terms of technological performance and innovation. We wish him and his family the best.”

During the last four years, Dr. Saksena has broadened his technology leadership position at Sonus Networks as he helped to shape and set the future of Sonus' technology. As Chief Scientist for the company, he was responsible for Sonus' advanced technology direction, guiding the future development of Sonus' wireless solutions, and increasing Sonus' technical focus on external audiences and government agencies. Dr. Saksena brings to this role first-hand knowledge of the service provider industry with over twenty years of experience in the telecom and cable market in senior technology positions. Prior to Sonus, he spent 16 years at AT&T building their data network services, software and network infrastructure for Frame Relay, ATM, and IP. He became an AT&T Fellow and Chief Technologist of the Data Networking Business Unit responsible for service and technology innovations around IP Quality of Service, Multi-protocol Label Switching (MPLS), and Voice over IP. After AT&T, he served as the CTO and VP of Engineering of two start-up companies, MaxComm Technologies and Narad Networks, focused on developing next generation technologies for the DSL and cable markets. Dr. Saksena has published over 100 papers and has been awarded over 15 patents. He holds a Ph.D. degree in Electrical Engineering from the University of Illinois at Urbana-Champaign. He is a Senior Member of the IEEE.

“Sonus has a proud history of being the industry's technology leader and innovator. I am looking forward to taking on a senior leadership role in driving the technology direction for the Company and creating solutions that will enable our customers to deliver sophisticated next-generation services worldwide,” said Dr. Saksena. “The industry is poised for a significant leap into converged multimedia services delivered over broadband and wireless networks. We have a number of innovations underway at Sonus that will drive this evolution and enable new value propositions for end-users of next-generation communications services.”

“The CTO role is a pivotal position at Sonus that requires an individual with superior intellect and business acumen to reinforce a culture that recognizes and rewards innovation and excellence. I am very pleased to welcome Vikram to this new position as I am confident he will enhance our management team and serve our customers and shareholders well,” concluded Ahmed.

“It has been an honor to play a role in the development of this dynamic company. With Sonus' considerable technical assets, people and relationships in the industry, the Company is one of the best positioned leaders in next-generation communications” said Hluchyj. “The transformation of the world's communications networks to voice over IP offers Sonus significant opportunities for continued strong growth. I have had the privilege of collaborating with Vikram during his time at Sonus and he is an accomplished technologist, business leader, and a strong voice in the market. It is clear that he will be an important member of the senior executive team, helping to drive the company forward.”

Sonus Network is a recognized leader in the market, underscored with continual growth and record performance throughout 2006. Today, Sonus is deployed as the foundation for many of the world's largest next-generation communications networks. Sonus has a strong legacy of technology leadership and innovation with nearly 600 engineers and developers around the globe working every day to support and deliver advanced solutions for evolving wireline and wireless operators' needs.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice over IP (VoIP) infrastructure solutions for wireline and wireless service providers. With its comprehensive IP Multimedia Subsystem (IMS) solution, Sonus addresses the full range of carrier applications, including residential and business voice services, wireless voice and multimedia, trunking and tandem switching, carrier interconnection and enhanced services. Sonus' voice infrastructure solutions are deployed in service provider networks worldwide. Founded in 1997, Sonus is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://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' Quarterly Report on Form 10-Q dated May 8, 2006, filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. Risk factors include among others: the impact of material weaknesses in our disclosure controls and procedures and our internal control over financial reporting on our ability to report our financial results timely and accurately; the unpredictability of our quarterly financial results; risks and uncertainties associated with the Company's announced review of its historical stock option grants and accounting, including any potential impact on the Company's financial statements or results, any tax liabilities or penalties, the Company's inability to timely report with the Securities and Exchange Commission, the Company's potential inability to meet NASDAQ requirements for continued listing, potential investigations, regulatory actions or litigation arising out of the review or any restatement; risks associated with our international expansion and growth; consolidation in the telecommunications industry; and potential costs resulting from pending securities litigation against the company. 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.

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.