Sonus Networks' Voice Infrastructure Solutions and Services Featured in T-Systems Exhibit at CeBIT 2003

For more information, please contact:

WESTFORD, Mass., March 12, 2003 – Sonus Networks (Nasdaq: SONS) today announced that it is participating with T-Systems at CeBIT, the world's largest telecommunications and IT exhibition. At CeBIT, which is being held March 12-19 in Hanover, Germany, T-Systems, a division of Deutsche Telekom, is highlighting its new Multi-Service Platform (MSP), which enables the delivery of cost-effective voice over IP (VoIP) services to multinational corporations. Sonus' Open Services ArchitectureTM (OSA) and voice infrastructure solutions form the foundation for T-Systems' MSP network.

CeBIT 2003, which will host more than 6,500 exhibitors from 70 countries and 700,000 attendees, is being held at the Deutsche Messe AG exhibition center. The Deutsche Telekom booth is located in Hall 26, at Booth A 01.

"CeBIT is one of the premier international telecommunications industry events, and we are absolutely thrilled to support T-Systems in their exhibition," said Michael O'Hara, vice president, marketing, Sonus Networks. "This venue affords a unique opportunity to highlight the partnerships and leading-edge technologies that position T-Systems at the forefront of telecommunications solutions for corporations."

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network. With its Open Services ArchitectureTM (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.

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