Sonus Networks Announces Participation in Upcoming Financial Conference

WESTFORD, Mass., January 31, 2008 – Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider IP-voice infrastructure solutions, announced today that the company will participate in the following upcoming event with the financial community:

Thomas Weisel Partners Technology, Telecom & Internet Conference 2008
San Francisco, Calif.
Wednesday, February 6th, 2008 at 8:00 a.m., PST
Speaker: Hassan Ahmed, chairman, president and chief executive officer, Sonus Networks

About Sonus Networks

Sonus Networks, Inc. is a leading provider of IP-voice 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.

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.