WESTFORD, Mass., June 3, 2002 - Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure solutions for the new public network, will host a conference call and webcast presentation on Tuesday, June 11, 2002 at 10:30 am EDT. In the presentation, Bob Dye, Sonus' director of strategic marketing, will outline Sonus' strategy for the cable market and provide an overview of Sonus' newly introduced SMARRT Cable solution (see today's press release "Sonus Introduces SMARRT Cable Solution at SUPERCOMM 2002 Mr. Dye will also address the market factors driving the deployment of telephony by cable operators (MSOs), and highlight how operators can gain a competitive advantage through packet voice.

Date: Tuesday, June 11, 2002

Time: 10:30 am EDT

To listen via the Internet: Sonus will host a live webcast of the conference call. To access the webcast, visit Sonus' Investor Relations site at http://www.sonusnet.com/investor.cfm.

To listen via telephone: Dial-in number: (800) 883-9624

Replay: A replay of the webcast will be available on the Sonus Networks Investor Relations site through Tuesday, June 25, 2002. To access the replay of the webcast, go to Sonus' Investor Relations site at http://www.sonusnet.com/investor.cfm.

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network. With its Open Services Architecture (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking, residential access and Centrex, tandem switching, and IP voice termination, as well as enhanced services. Sonus' award-winning 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 Westford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

SMARRT and Open Services Architecture are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.