Sonus Now Present in Five of the World's Largest Network Operators; North American Division of World's Largest Operator Selects Sonus for IP Interconnect

WESTFORD, Mass., May 9, 2007 - Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced today that Sonus Networks has been chosen as a supplier for France Telecom International Wholesale's voice over IP network. France Telecom International Wholesale will deploy Sonus-based solutions in the United States to expand its international voice wholesale services.

"Sonus offers an exceptional value proposition for wholesale providers looking to grow their footprint. For France Telecom's International Wholesale division, in particular, Sonus' robust support for international signaling standards and our global presence and support capabilities are especially compelling," said Hassan Ahmed, chairman and CEO, Sonus Networks.

"France Telecom is extending its global network to leverage the benefits of IP, which include the ability to scale our network and streamline the operations of our North American presence," said Jean-Marc Escalettes Vice President of France Telecom Wholesale Solutions for the Americas region. "We chose Sonus as our partner because of their established leadership and their ability to build and support proven IP-based voice networks."

France Telecom International Wholesale network will be comprised of the GSX9000™ Open Services Switch, PSX™ Call Routing Server, SGX™ Signaling Gateway, and the Sonus Insight™ Management System. In addition, they will be deploying the Sonus Network Border Switch for enhanced security and advanced peering capabilities.

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, whether the 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.

The product information in this press release is for informational purposes only and is subject to change at Sonus' sole discretion without notice.  Sonus has no obligation or commitment to develop or deliver any future release, upgrade, feature, enhancement or function described in this release.  The information is provided "AS IS," with all faults, and without any warranties whatsoever, express or implied, including, but not limited to, warranties of merchantability, performance, or fitness for a particular purpose.

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.