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VON Fall 2004 Booth #304

CEO Hassan Ahmed to Deliver Keynote on Changing Telecom Landscape

CHELMSFORD, Mass., October 18, 2004 – At VON Fall 2004, Sonus Networks (Nasdaq: SONS) will be highlighting technology trends in voice over IP (VoIP) infrastructure and related IP-based enhanced services in its exhibit and through participation in several conference presentations. In addition, Sonus chairman and chief executive officer Hassan Ahmed will be delivering a keynote address that will explore the impact of voice over broadband technologies and the role they will play redefining the current telecom landscape. The Sonus booth will feature live demonstrations of Sonus’ packet-based voice solutions for applications including voice over broadband and trunking, as well as Sonus’ SMARRT Services such as hosted PBX, voice conferencing and messaging.

Sonus also has a major presence in the educational portion of the conference, with executives participating in the following sessions:

Monday, October 18, 2004, 10:45 am - 12:15 pm
Session: Pre-Conference Workshop: Building the VoIP Central Office
Speaker: Michael Rubin, director, product management

Tuesday, October 19, 2004 2:00 pm - 2:30 pm
Session: Keynote: VoBB - Redefining the Telecom Landscape
Speaker: Hassan Ahmed, chairman and CEO

Tuesday, October 19, 2004, 3:45 pm - 5:00 pm
Session: Venture Capital: The Sharpened Focus

Panel Chair/Speaker: Rubin Gruber, founder

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.