New Marketing Programs Designed to Attack Global Market Opportunities and Bolster Company’s Leadership Position with World’s Largest Service Providers

WESTFORD, Mass.  , March 15, 2007 – Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced today that it is launching new dedicated-focus marketing programs that align directly to the Company’s target growth areas: Trunking Networks, Access Networks, Wireless Networks, and Applications, as well as a separate group focused on building Sonus’ corporate brand on a global basis.  The new alignment of Sonus’ marketing resources is designed to deliver scalable strategic initiatives that highlight the key differentiators that have earned Sonus a leading position in the dynamic next generation communications industry.  The Company also announced today that after three years of helping to grow Sonus’ marketing organization to support its global presence, the Company’s Chief Marketing Officer, Steve Edwards will step down at the end of the month to pursue other opportunities.

“Sonus is a leader in the next-generation IP voice market. The evolution of our marketing organization mirrors the development of the IP voice industry itself, and as the market for our solutions continues to accelerate, Sonus is committed to meeting the unique needs of network operators in each of our target growth areas,” said Hassan Ahmed, chairman and CEO, Sonus Networks. “Steve has done a fantastic job helping to build Sonus into one of the preeminent brands in the IP voice industry and establishing trusted relationships with today’s leading operators. We’re excited to build on the solid foundation he helped to establish and take Sonus’ marketing programs to the next level.”

The new design of the marketing organization reflects Sonus’ customer-first approach and strengthens the alignment among the Company’s marketing, engineering and global teams. In addition, it is designed to target more effectively Sonus’ global audiences, for which unique market dynamics are driving the demand for Sonus’ solutions.

According to independent market research from Synergy, Sonus already leads the market in key segments of the IP voice industry worldwide, as well as in North America and Japan . Carrying more than 4x the amount of IP voice traffic than any other vendor, according to iLocus Research, the percentage of traffic carried over Sonus’ IMS-ready networks has increased steadily in 2006 as more major network operators have migrated traffic onto their Sonus platform. Sonus now has major network deployments underway in each of its target growth areas, including some of the world’s largest trunking, access and wireless networks. In addition, Sonus continues to pioneer new opportunities through the development of advanced applications.

“Sonus is one of the most dynamic companies in the IP-voice industry, and it’s been a pleasure to lead the Company’s marketing initiatives during such a fascinating period of the industry’s development,” said Edwards. “The Company is poised to take the communications industry to the next level by setting new standards for performance and reliability.”

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 the 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.