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Leading Portuguese Technology Company Provides Full Sonus Product Set

WESTFORD, Mass., November 25, 2002 - Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure solutions for the new public network, today announced that COMPTA has established a relationship with Sonus to distribute and support the complete Sonus product line in Portugal. Under terms of the non-exclusive agreement, COMPTA will provide Sonus' industry-leading packet voice solutions including the GSX9000^TM Open Services Switch, the Insignus^TM Softswitch and the Sonus Insight^TM Management System.

"COMPTA is very highly regarded in the Portuguese communications market, and we believe this partnership will yield good results," said Gary Rogers, vice president, worldwide sales, Sonus Networks."We look forward to working with COMPTA to facilitate the adoption of next-generation packet voice technologies with telecommunications providers in Portugal."

For more than 30 years, COMPTA has delivered solutions and services to the IT and communications industry in Portugal.As a leading technology partner, COMPTA offers a full spectrum of products and capabilities including consulting and project management, procurement, systems integration, network operations and management, and network maintenance and repair.

"Our technical skills, combined with a deep knowledge of the Portuguese market and partnerships with leading global players, allow us to provide our customers with high-value, best-in-breed integrated solutions," said Afonso Chaby, CEO, COMPTA."We are extremely pleased to add the Sonus portfolio of packet voice products to our offerings, and look forward to building a long-lasting and fruitful relationship."

About COMPTA

COMPTA is a Portuguese company that for almost 30 years has delivered services and solutions in the IT and Communications Industry.As technology partner, COMPTA supplies specialized services and products, employing the most recent technologies. With a deep knowledge of the Portuguese market and technology trends worldwide, COMPTA's areas of expertise include: Multiservice Networks (Voice, Data, Image over LAN and WAN) Integration Services, e-business applications, security, content management, Help Desk systems and multimedia contact centers.COMPTA has developed a wide set of partnerships that allow it to deliver to the market vast solutions of top-level technologies.For more information, visit us at: www.compta.pt.

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^TM (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 Sonus' Quarterly Report on Form 10-Q, dated November 13, 2002 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.

GSX9000, Insignus, Sonus Insight 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.