TianFengJuYuan Technology to Distribute Complete Sonus Product Portfolio

BEIJING, CHINA, April 05, 2005 - Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, today announced that it has formed a distribution relationship with Beijing TianFengJuYuan Technology Co., Ltd. Under this non-exclusive agreement, TianFengJuYuan will offer the full range of Sonus' industry-leading packet voice products to the Chinese carrier market, including the GSX9000TM Open Services Switch, the InsignusTM Softswitch, and the Sonus InsightTM  Element Management System.

Established in 1993, Beijing TianFengJuYuan Technology Co., Ltd. specializes in research, development, production, sales and services in the technology and communication sector and its products and services have been deployed by the financial industry and government departments. TianFengJuYuan has identified the telecommunications market as a strategic sector for the company and partners with international and domestic vendors to deliver complete solutions to carriers in China.

At the signing ceremony held in Beijing, China, Simon Naylor, Sonus' Vice President for Asia Pacific/Japan said, "We are pleased to be partnering with a company as rich in experience and expertise as TianFengJuYuan. China is a dynamic and rapidly growing market in the next generation telecommunications sector and our partnership with TianFengJuYuan expands our presence in this important market."

"According to industry studies which have been conducted on the information technology market in China, VoIP penetration is expected to increase dramatically over the next decade and is expected to be one of the fastest growing sectors in the Chinese telecommunications industry. TianFengJuYuan is pleased to be partnering with a world-wide market leader in carrier-class VoIP solutions to target this important segment of the market", said Wang Wei, chief executive officer, TianFengJuYuan.

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 dated March 15, 2005, 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. 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 and Insignus are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.