WESTFORD, Mass., August 10, 2007 – Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, today announced that it received a NASDAQ Staff Determination letter on August 6, 2007, indicating that the Company is now in compliance with the NASDAQ continued listing requirements set forth in Marketplace Rule 4310(c)(14).

On August 2, 2007, Sonus Networks filed its Form 10-K for the period ended December 31, 2006, and its Forms 10-Q for the periods ended June 30, 2006, September 30, 2006, and March 31, 2007. Based on these filings, Nasdaq staff has determined that the Company has regained compliance with all Nasdaq rules, including Rule 4310(c)(14). As such, this matter is now closed and the Company's securities will continue to be listed on The Nasdaq Global Select Market.

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 for the second quarter of 2007, 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; whether the Company will remain listed on the NASDAQ Global Select Market; regulatory actions or litigation arising out of the Company's voluntary stock option review and related 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. All other company and product names may be trademarks of the respective companies with which they are associated.