Sonus Networks (Nasdaq: SONS), a market leader in IP communications infrastructure, today announced that based on its review to date, the Company expects to report a significant decrease in year-over-year revenue for the quarter ended September 30, 2008. The Company further expects that its year-over-year revenue for the full year 2008 will decrease from the full year 2007.

The Company continues to maintain a solid financial base, ending the third quarter with no debt and with cash, cash equivalents, marketable securities and long-term investments totaling more than $400 million, up from approximately $398 million at the end of the second quarter 2008.

"We are disappointed with our expected revenue for the third quarter and the second half of 2008," said Richard Nottenburg, president and CEO of Sonus Networks. "Our business experienced weakness toward the end of the quarter, due to several factors including the challenging environment. We expect this to continue for the foreseeable future."

The Company will provide additional financial details for the three and nine months ended September 30, 2008 in its quarterly earnings release and conference call, scheduled for November 6, 2008. Information regarding the conference call details will be provided at a later date.

About Sonus Networks

Sonus Networks, Inc. is a market leader in IP communications infrastructure 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.