Next-Generation Network Supports Traditional and Enhanced Voice Services; Carrier Planning to Offer Access Services on Sonus Platform

WESTFORD, Mass., September 2, 2003 – Sonus Networks (Nasdaq: SONS), a leading provider of carrier packet voice infrastructure solutions, today announced that Wisconsin-based communications provider Powercom has deployed Sonus' Open Services Architecture (OSA) and solutions to deliver a range of voice services to business and residential subscribers. With the Sonus-based network, Powercom currently supports offerings such as domestic and international long distance, toll-free calling and calling card services, with plans to deliver local voice services in the future.  

"The Sonus packet voice solutions have enabled us to cost-effectively move to the next generation of telephony," said David Larkin, chairman, Powercom. "We required a solution that would enable us to provide the same levels of reliability, voice quality and service that our customers have come to expect from us, but would also allow us to deliver new offerings and expand our customer reach. Sonus met all of our technical and business requirements, and we are very pleased with how our deployment has progressed."

Powercom has implemented a full set of Sonus voice infrastructure solutions including the GSX9000 Open Services Switch, the Insignus Softswitch and the Sonus Insight Management System. Powercom has completed the first phase of deployment with Sonus, and has migrated all of its long distance voice traffic from the carrier's original circuit-switched network to the Sonus packet voice platform. In later deployment phases, Powercom expects to offer facilities-based Class 5 voice services on the Sonus network, as well as additional enhanced voice services.

"Powercom has gained a reputation among its customers as a communications provider that combines leading-edge technologies and outstanding service," said Michael O'Hara, vice president, marketing, Sonus Networks. "We're pleased to play an integral role in building their next-generation voice infrastructure, and look forward to helping them to evolve their network."  

About Powercom 

Powercom is a telecommunications company providing Local and Long Distance telephone service, Internet access and Web solutions to the businesses and residents of Wisconsin and the Midwest. Privately owned since its founding in 1985, Powercom has grown to employ a team of more than 50 people. Powercom serves clients through internal sales channels as well as independent agent relationships. Powercom is headquartered in Beaver Dam, Wisconsin and has its switching and network facility in Milwaukee, Wisconsin. Additional information on Powercom is available at http://www.powercom.net.

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice 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, 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.

This release may contain projections or other forward-looking statements regarding future events or the future financial performance of Sonus that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. Readers are referred to the "Cautionary Statements" section of Sonus' Quarterly Report on Form 10-Q, dated August 13, 2003 and filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. These risk factors include, among others, the adverse effect of recent developments in the telecommunications industry, the weakened financial position of many service providers, Sonus' ability to grow its customer base, dependence on new product offerings, market acceptance of its products, rapid technological and market change and manufacturing and sourcing risks. In addition, any forward-looking statements represent Sonus' views only as of today and should not be relied upon as representing Sonus' views as of any subsequent date. While Sonus may elect to update forward-looking statements at some point, Sonus specifically disclaims any obligation to do so.

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.