Gruber Retires From Sonus

CHELMSFORD, Mass. -- Sonus Networks (Nasdaq: SONS - News), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, today announced that its Chairman Emeritus, Rubin Gruber, will be retiring from the Sonus Networks Board of Directors at the end of August. Mr. Gruber has served on Sonus Networks' Board of Directors since co-founding the company in 1997 and he will continue to be available to assist the Company.

"During the last eight years, I have had the unique opportunity to experience Sonus' growth from an idea into a global leader in the VoIP market," commented Rubin Gruber. "Sonus has achieved a great deal since its founding, and I remain excited about Sonus' prospects as a leader in the VoIP industry."

"As co-founder and a member of our senior management team, Rubin's business acumen, industry experience, and his unwavering commitment to building Sonus into a recognized leader in the market has been a great benefit to Sonus," said Hassan Ahmed, chairman and CEO, Sonus Networks. "Rubin is one of the true pioneers in our industry. Although I will personally miss his presence in the Boardroom, I share his enthusiasm for Sonus' future and look forward to building on the Company's leadership position."

Following Mr. Gruber's retirement, the Sonus Networks Board of Directors will consist of the following members: Hassan Ahmed, Bert Notini, Ed Anderson, Paul Severino, H. Brian Thompson and John Cunningham.

Sonus Networks Inc.