Sonus Networks Evaluated for Completeness of Vision and Ability to Execute

WESTFORD, Mass., April 30, 2007 – Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, announced today that the recently issued Gartner “Magic Quadrant for Softswitch Architecture, 2007” report (Bettina Tratz-Ryan, et al, date), which outlines vendors in the IP-based voice industry, positioned Sonus in the “Leader” quadrant.

Sonus Networks has been leading the world’s migration to IP voice systems, partnering with the industry’s most innovative wireline and wireless network operators. By choosing Sonus solutions, network operators have been able to realize new operational efficiency while laying the foundation for the delivery of converged voice, data and multimedia services that redefine the end-user experience.  Sonus customers currently carry more than 33 billion minutes of IP voice traffic every month.

“We believe this analysis is an honor and an important achievement for the Company. Sonus is an industry visionary with a unique ability to deliver value to our customers today and into the future as their networks evolve,” said Hassan Ahmed, chairman and CEO, Sonus Networks.  “Sonus is committed to maintaining its leading position in key segments of the IP voice market, while making new strides to expand our presence in emerging geographies and market segments.

With customer deployments throughout North America, Europe, and Japan , Sonus offers a broad portfolio of carrier-class IP-based voice solutions for incumbent and competitive wireline and wireless network operators, Internet Service Providers (ISPs), and cable operators. Sonus offers complete solutions for IP based core and access networks, as well as a robust platform for the delivery of enhanced next generation services.

About the Gartner Magic Quadrant

The Magic Quadrant is copyrighted 2007, by Gartner, Inc. and is reused with permission. The Magic Quadrant is a graphical representation of a marketplace at and for a specific time period. It depicts Gartner's analysis of how certain vendors measure against criteria for that marketplace, as defined by Gartner. Gartner does not endorse any vendor, product or service depicted in the Magic Quadrant, and does not advise technology users to select only those vendors placed in the "Leaders" quadrant. The Magic Quadrant is intended solely as a research tool, and is not meant to be a specific guide to action. Gartner disclaims all warranties, express or implied, with respect to this research, including any warranties of merchantability or fitness for a particular purpose.

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, whetherthe Nasdaq Listing Council will continue the delisting stay or grant an extension or that the company's securities will remain listed on the NASDAQ Stock Market, 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.