WESTFORD, Mass., August 1, 2003  – Sonus Networks (Nasdaq: SONS) today issued the following statement regarding erroneous and false information reported by Multex on July 31. An article appeared on Multex Investor indicating that Sonus Networks had revised its financial guidance for Q3 FY2003 and for the fiscal year 2003. The information included in the article was incorrect and was not provided by the company.

With regard to its projected future results, Sonus Networks refers you to the financial guidance provided as part of its Q2 quarterly financial conference call on July 10, 2003, which included, among other things, that it expects its revenues to increase in the third quarter of FY2003 by 15-20% over reported second quarter 2003 revenues of $21.4 million. For more detailed information on the guidance provided by the company, please refer to the webcast of this conference call, which can be accessed in the Investor Relations section of Sonus' web site at www.sonusnet.com. 

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 May 9, 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 is a trademark of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.