Leading VoIP Provider Expands Sales Team to Support Growing Carrier Demand

Swindon, UK, March 6, 2006 - Sonus Networks (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, today announced that it has expanded its European regional sales team in response to increased demand by carriers looking to leverage the benefits of Sonus' award-winning IP Multimedia Subsystem (IMS)-ready solutions.

“Over the past year, we have witnessed a dramatic increase in the demand for next generation VoIP solutions throughout the European region,” said Bettina Tratz-Ryan, Research Director, Networking & Communications Equipment with Gartner, Inc. “There are few vendors that have established a footprint in this market, and Sonus is one of them.”

David Gontharet has been appointed as sales director for Southern Europe, bringing ten years' telecoms sales experience to Sonus. Prior to joining Sonus, David held senior sales management positions across Europe and Asia while at Alcatel, Lucent and Cosine Communications. The Southern Europe sales engineering team will also be supported by the addition of Ian Chab, a sales engineer with strong telecoms experience, and a former member of Lucent, NetCentrex and SFR.

“These appointments follow recognition that the market is developing fast in Southern Europe, with many carriers assessing the potential of technologies such as Voice over Broadband and IMS,” said Joop van Aard, vice president Europe, Sonus Networks. “These latest appointments bring with them deep industry knowledge, and both will be great assets to the growing European team at Sonus.”

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 Chelmsford, 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 the “Risk Factors” section of Sonus' Annual Report on Form 10-K, dated March 15, 2005, and the “Cautionary Statements” section of Sonus' Quarterly Report on Form 10-Q, dated November 8, 2005, both filed with the SEC, which identify 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 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.

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