CHELMSFORD, Mass., November 23, 2004 – Sonus Networks (Nasdaq: SONS), a leading provider of voice over IP (VoIP) infrastructure solutions, today announced that Hassan Ahmed, Sonus Networks' chief executive officer (CEO) and chairman, will be participating in the following investor conference:

Credit Suisse First Boston Technology Conference

Scottsdale, Arizona
Thursday, December 2, 2004, 1:30 pm
Speaker: Hassan Ahmed, chairman and CEO

Interested investors can access a live audio webcast of the presentation on the Investor Relations section of the Sonus Networks website at www.sonusnet.com. A full schedule of Sonus Networks' investor activities is available on the Sonus Networks Investor Relations site.

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 and Insignus are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.