WESTFORD, Mass., March 31, 2003 – Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure solutions for the new public network, today announced the appointment of Bert Notini, executive vice president and CFO of Manufacturers Services Limited (NYSE: MSV), to the company's board of directors.

"We are pleased to bring Bert Notini on as the newest member of Sonus Networks' board of directors," said Hassan Ahmed, president and CEO, Sonus Networks. "With his extensive background in the financial and legal fields, Bert brings invaluable experience and perspective to the Sonus Networks board, particularly in the area of corporate governance. Bert will be a tremendous asset to our company as we go forward."

"I am delighted and privileged to join the Sonus board of directors," said Notini. "Sonus is a premier telecommunications and technology company that has proven it can succeed. I look forward to working with the management team to guide the company through its next phases of growth."

Notini has worked with companies in the high tech industry for nearly 20 years. Since October 2000, Notini has served as the CFO of Manufacturers Services Limited, a global electronics and supply chain services company. He joined Manufacturers Services Limited in May 2000 as executive vice president, business development and general counsel, and served in that capacity until October 2000.

Previously, Notini spent five years at Wang Global, where he held the positions of executive vice president, corporate development and administration, and general counsel. Wang Global was acquired by Getronics NV in June 1999 and Notini served as executive vice president of Getronics until February 2000. Prior to joining Wang, Notini was a partner at the Boston-based law firm Hale and Dorr LLP. Notini holds an A.B. from Boston College, an M.A. from Boston University, and a J.D. from Boston College Law School. Notini also serves as a director of ePresence, Inc.

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network. With its Open Services ArchitectureTM (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' Annual Report on Form 10-K, dated March 19, 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.

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.