Industry leader establishes additional regional support across Europe, Middle East & Africa to drive business

SWINDON, UK - February 22, 2005 - Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, today announced its continued global expansion with the appointment of two new sales managers targeting key accounts across Europe, Middle East and Africa (EMEA). During the last year, the company has significantly strengthened its organization throughout EMEA to serve the growing VoIP market, including next-generation carriers, as well as, established service providers. Additionally, this increased presence in EMEA will enable Sonus to better support its current customers as they deploy global networks.

Gerd Schuetz has been appointed as sales manager for Central and Eastern Europe. In this role, Schuetz will lead sales across this territory, with a focus on Deutsche Telekom's T-Systems and T-Online. A seasoned sales professional, Schuetz brings more than 10 years of industry experience to Sonus. Prior to joining Sonus, Schuetz was most recently with Vocaltec, where he was responsible for VoIP infrastructure sales to international service providers.

The company has also appointed Laurance Balls as sales manager for Northern Europe. Balls brings significant experience in the telecommunications industry, having spent his career focused on the VoIP market in Europe. Balls joins Sonus from Verso where he was responsible for generating carrier VoIP sales in Europe. Prior to joining Verso, Balls was also part of the European sales organizations at Clarent, Mitel and BT.

"We are pleased to have Gerd and Laurance join the Sonus team. This is another step forward in the ongoing fulfillment of our global strategy of supporting key geographies," said Joop van Aard, vice president for sales, Europe, Middle East and Africa. "We are continuing to build the European sales and support organizations to ensure that our global customer base receives the highest level of customer care as well as our best in class products and technology.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice over IP (VoIP) infrastructure solutions for wireline and wireless service providers. With its Open Services ArchitectureTM (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking and tandem switching, residential and business access, network border switching and enhanced services. Sonus' 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 Chelmsford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

This release may contain forward-looking statements regarding future events 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 "Risk Factors" section of Sonus' Annual Report on Form 10-K/A dated July 28, 2004 and filed with the SEC, and the "Cautionary Statements" section of Sonus' Quarterly Report on Form 10-Q, dated November 9, 2004 and filed with the SEC, which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements. 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.