Sonus Experts Present On Rapidly Evolving Trends in IMS and Wireless VoIP Solutions

CHELMSFORD, Mass., March 1, 2006 - Sonus Networks (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced that at this year's Spring 2006 Voice on the Net (VON) Conference and Expo, the Company will demonstrate how Sonus' industry leading IP Multimedia Subsystem (IMS)-based solutions are changing the dynamics of the telecommunications industry. The demonstrations (Booth #517) will highlight how Sonus solutions are bringing together the world's communications networks through industry leading consumer Voice over Broadband, wireless, security and peering solutions.

In addition to Sonus' presence in the exhibit hall, executives from the company will deliver a variety of educational presentations highlighting key trends and issues in the evolution of communications networks towards an all-IP architecture.

Sonus speakers and topics scheduled to appear at the Spring VON 2006 conference include:

Wednesday, March 15, 2006, 1:30 pm - 2:00 pm
Session: Power Presentation - IMS, the New Competitive Landscape
Speaker: Mike Hluchyj, Founder and Chief Technology Officer

Wednesday, March 15, 2006, 2:30 pm - 3:45 pm
Session: WiMax Technology Update
Speaker: Vikram Saksena, Chief Architect

Thursday, March 16, 2006, 11:00 am - 12:00 pm
Session: So You Can Spell VoIP, Now What?
Speaker: Kevin Summers, Senior Product Manager, IMS Solutions

Friday, March 17, 2006, 1:30 pm - 2:45 pm
Session: Expanding the Mobile Frontier
Speaker: Bruce Trvalik, Director of IMS Solutions

Pulver.com's VON Spring 2006 conference begins on Tuesday, March 14, 2006 and will conclude on Thursday, March 17, 2006. All events will be held at the San Jose Convention Center. Spring VON 2006 is the leading conference and exhibition for the IP communications industry and is attended by carriers, service providers, mobile operators and vendors.

For more information on VON Spring 2006, please visit www.pulver.com/von.

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 Chelmsford, 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 the “Risk Factors” section of Sonus' Annual Report on Form 10-K, dated March 15, 2005, and the “Cautionary Statements” section of Sonus' Quarterly Report on Form 10-Q, dated November 8, 2005, both filed with the SEC, which identify 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 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. Sonus GSX9000 Open Services Switch, PSX Call Routing Server, SGX Signaling Gateway, and the Sonus Insight Management System are trademarks of Sonus Networks, Inc. All other company and product names may be trademarks of the respective companies with which they are associated.