Technology Executive Brings More than 20 Years Experience in Hardware and Software Systems Design and Implementation

WESTFORD, Mass., June 19, 2000 – Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure products for the new public network, today announced that it has named Paul R. Jones as its vice president, engineering. In this role, Jones will lead all engineering and development functions at Sonus, including hardware development, software development and quality assurance. Jones will report directly to Sonus president and CEO, Hassan Ahmed. 

The company also announced today that Kwok Wong, Sonus’ vice president of engineering since the company’s inception in 1997, has been named vice president, advanced development. Wong will report to Jones in this position.

"Over the past year, we’ve achieved significant engineering and development milestones, including the commercial deployment of our award-winning voice infrastructure solutions," commented Ahmed. "Paul brings to Sonus a distinguished career in product development, one that provides the broad leadership and experience that will enable us to scale our engineering organization as we pursue the enormous market opportunity before us. We’re looking to Paul and Kwok to drive the continued innovation that is the lifeblood of our company." 

"Sonus has quickly established itself as a technological leader in one of the most fundamental markets the communications industry has seen," said Jones. "I look forward to building on this success and working with the rest of the Sonus executive team to move the company to the next level."

Jones joins Sonus from Indus River Networks, a leading developer of VPN solutions for the high-growth remote access market. During his three years as vice president of engineering, he directed all product development, documentation and quality assurance for Indus River’s sophisticated managed VPN system. He also staffed and managed the company’s customer support and operations organization.

Previously, Jones spent six years at Stratus Computer, Inc. where, as vice president of engineering, he led all hardware and software development and managed a 600-person engineering team. While at Stratus, he also served as vice president, distributed computing and chief operating officer for Isis Distributed Systems (acquired by Stratus). Before joining Stratus, Jones held senior engineering management positions at Stellar Computer, Inc., developer of the world’s first graphics supercomputer and Prime Computer, Inc., supplier of high-end mini-computers.

Jones is a member of the Institute of Electrical and Electronics Engineers (IEEE) and the Association for Computing Machinery (ACM). He holds patents in the area of data processing apparatus development. Jones was granted a Master of Science degree in Electrical and Computer Engineering from the University of Massachusetts, Amherst and a Bachelor of Arts degree in English and American Literature from Brown University. 

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice infrastructure products for the new public network. Sonus’ solutions enable service providers to deploy an integrated network capable of carrying both voice and data traffic, and to deliver a range of innovative, new services. The Sonus Open Services ArchitectureTM (OSA) and award-winning Packet Telephony suite cut the time-to-market for competitive new service products, allowing carriers and third-party developers to expand marketshare and build important new revenue streams. Its highly scalable products fully interoperate with and extend the life and utility of today’s public network. Sonus embodies in its management and staff decades of experience in developing carrier-class voice, data and multimedia solutions for implementation in the world’s largest networks. Sonus, founded in 1997, is headquartered in Westford, Massachusetts. 

This press release may contain forward-looking statements relating to future events or future financial performance that involve risks and uncertainties. These statements are made pursuant to the safe harbor provisions of Section 21E of the Securities Exchange Act of 1934. These statements are only predictions and actual results could differ materially from those anticipated in these statements based upon a number of factors including those risk factors identified in the Company’s Prospectus dated May 24, 2000.

Open Services Architecture is a trademark of Sonus Networks. All other company and product names may be trademarks of the respective companies with which they are associated.