CHELMSFORD, Mass., February 16, 2005 - Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, will host a webcast presentation on Wednesday, February 23, 2005 at 12:00 pm ET. In the presentation Mike Hluchyj, Sonus' founder and chief technology officer, and Bob Dye, Sonus' vice president of strategy, will address the market factors driving the deployment of voice over broadband (VoBB) solutions by service providers worldwide and highlight how operators can gain a competitive advantage through these deployments. Sonus will also outline its strategy for the VoBB market and provide an overview of its solutions.

Date: Wednesday, February 23, 2005
Time: 12:00 pm ET

To listen via the Internet: Sonus will host a live webcast of the presentation. To access the webcast, visit Sonus' Analyst Relations site at http://www.sonusnet.com/contents/press/webcasts.cfm

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 Architecture (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.