CHELMSFORD, Mass., June 1, 2005 – Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, announced that at this year's SUPERCOMM 2005 conference, the company will be highlighting technology trends in voice over IP (VoIP) infrastructure in its exhibit and through participation in several conference presentations. In the Sonus Networks exhibit, the company will feature live demonstrations of its industry-leading technology and detail how its solutions provide a seamless migration path to an all-IP network. The SUPERCOMM 2005 conference will be held June 6-9 at the McCormick Place Convention Center in Chicago, Illinois, with the exhibitions open June 7-9.

Executives from Sonus are taking an active role in the educational portion of the conference. Sonus will be participating in the following conference sessions:

Monday, June 06, 2005, 12:30 pm
Session: Industry Update - Mobile Multimedia: The Path Forward
Speaker: Bruce Trvalik, director of solutions management

Monday, June 06, 2005, 4:30 pm
Session: Plenary Panel - Global Communications: Realizing the Vision
Speaker: Hassan Ahmed, CEO and chairman

Tuesday, June 07, 2005, 2:15 pm
Session: Secure IP Telephony: Lock, Stock and Barrel
Speaker: Mike Hluchyj, founder and CTO

Wednesday, June 08, 2005, 9:45 am
Session: IP Services and Networks
Speaker: Hassan Ahmed, CEO and chairman

SUPERCOMM is the premier annual communications and information technology exhibition and conference. Additional information on SUPERCOMM 2005 can be found at www.supercomm2005.com.

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. Founded in 1997, Sonus is headquartered in Chelmsford, Massachusetts of U.S. 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.