Sonus Appoints New CFO

CHELMSFORD, Mass. -- Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, today announced that Ellen Richstone has joined Sonus as its chief financial officer (CFO), reporting to Sonus' president and chief operating officer (COO), Bert Notini. In this role, Richstone will lead the global financial and administrative functions of the company, including finance, investor relations, human resources and information technology.

"We are very pleased to welcome Ellen to Sonus," said Bert Notini, president and COO, Sonus Networks. "Ellen's extensive track record in building successful financial organizations and experience in the high technology industry makes her an ideal addition to Sonus' executive management team."

With more than 28 years of experience, Richstone is a senior executive with strong financial and executive leadership and an extensive background within the technology industry. Most recently, she was the president and chief executive officer of Entrepreneurial Resources Group, a global professional services firm that provides operational and financial solutions to companies worldwide. Prior to Entrepreneurial Resources Group, Richstone served as the CFO of Brooks Automation during the period when the company's revenue grew rapidly to a $700 million annual run rate. She has also served as the CFO of several other technology corporations, including Augat, Inc., Rohr Aerospace, and Honeywell Bull. Additionally, Richstone has held executive positions with Data General Corporation, and Polaroid Corporation. She is also currently a member of the Audit Committee of American Power Conversion's Board of Directors, as the financial expert.

"Ellen's proven skills in structuring global strategies and financial planning will be extremely valuable as Sonus continues to scale for the worldwide markets," said Hassan Ahmed, chairman and CEO, Sonus Networks. "Her appointment is another important step in the expansion and strengthening of our executive management. With the considerable talent Sonus added to its team during the last year, Sonus is well positioned to extend its leadership in 2005."

"I am excited to be joining the Sonus team. Sonus is recognized as a leader in the rapidly growing VoIP market and is well positioned to continue to build its market momentum with an expanding customer base, industry leading technologies and a strong balance sheet," commented Richstone. "I look forward to driving the company's financial and administrative operations to the next level."

Sonus Networks Inc.