CEO Hassan Ahmed to Deliver Keynote on Harnessing New VoIP Opportunities

CHELMSFORD, Mass., March 1, 2005 - Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, announced that at this year's Spring 2005 Voice on the Net (VON) Conference and Expo, the company will showcase its industry leading technology that is paving new roads in the emerging Voice Over Broadband (VoBB) industry. Sonus will feature live demonstrations of its packet-based voice solutions for consumers and businesses, as well as Sonus' SMARRT Services, such as pre-paid services, voice conferencing and messaging.

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 packet voice infrastructure and related IP-based enhanced services, and a keynote address by Sonus chairman and CEO Hassan Ahmed will explore what lies ahead for next generation networks.

Sonus speakers and topics scheduled to appear at the Spring VON 2005 conference include:

Monday, March 7, 2005, 10:45am - 12:15pm
Session: Media/Gateways Session in Workshop: VoIP Central Office
Speaker: Michael Rubin, director, product manager

Tuesday, March 8, 2005, 3:00pm - 3:30pm
Session: Keynote Address: Harnessing New VoIP Opportunities: What's Ahead for Next Generation Networks
Speaker: Hassan Ahmed, chairman and CEO

Tuesday, March 8, 2005, 5:15pm - 6:30pm
Session: General Session: Ten Years Back, Ten Years Forward
Speaker: Rubin Gruber, founder and chairman emeritus

Wednesday, March 9, 2005, 2:45pm - 4:00pm
Session: VC Update
Speaker: Rubin Gruber, founder and chairman emeritus

Pulver.com's VON Spring 2005 conference begins on Monday, March 7, 2005 and will conclude on Thursday, March 10, 2005. All events will be held at the San Jose Convention Center. Spring VON 2005 is the leading conference and exhibition for the IP communications industry and is attended by carriers, service providers, mobile operators and vendors. Co-located at the Spring VON 2005 conference and exhibition will be FastNet Futures 2005: Broadband in the Video Age, which will explore the access technologies and business models in delivering broadband.

For more information on VON Spring 2005, 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 Open Services ArchitectureTM (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking and tandem switching, residential and business access, network border switching and enhanced services. Sonus' voice infrastructure solutions, including media gateways, softswitches and network management systems, are deployed in service provider networks worldwide. Sonus, founded in 1997, is headquartered in Chelmsford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

Sonus is a registered trademark of Sonus Networks. Open Services Architecture, GSX9000, Insignus and Sonus Insight are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.