Sonus Networks Leads Wireless IP Voice Industry

WESTFORD, Mass. and BARCELONA, Spain, Feb. 12: Sonus Networks, Inc. (NASDAQ:SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced today at the 3GSM World Congress in Barcelona, Spain (Booth D46, Hall 2, Level 1) that the Company has surpassed a key milestone in the industry's migration to wireless IP voice. Sonus-based wireless networks worldwide now carry more than 10 billion minutes of voice traffic per month. According to the latest research report entitled, "Packetized Wireless Trunking: 2007 Status Report" by independent research firm iLocus, Sonus carries more than 37% of all wireless packet-based traffic. Sonus' IP Multimedia Subsystem (IMS)-ready solutions currently form the backbone of major wireless networks in the United States and Japan.

"Like their wireline counterparts, wireless network operators are now beginning to embrace IP-based technologies throughout their networks to take advantage of operational savings and to build a foundation for the delivery of enhanced next generation services, and they are turning to Sonus to help realize those benefits," said Basharat Ashai, Research Manager, iLocus. "Sonus has built some of the most sophisticated IP-based wireless networks in the world, carrying billions of minutes of traffic every month and growing rapidly."

Sonus' IP Multimedia Subsystem (IMS)-ready architecture for wireless networks delivers significant cost-savings, operating efficiency and the ability to build new revenue streams through the delivery of enhanced end user services. In addition, as the industry moves towards full IMS compliance, Sonus' solutions provide a seamless migration path, enabling wireless network operators to leverage the benefits of a converged network core for the delivery of rich, multimedia services that change the way people communicate.

"As wireless network operators continue to fight for customer acquisition and customer retention, the ability to manage costs and open the doors for new revenue streams becomes increasingly important," said Hassan Ahmed, chairman and CEO, Sonus Networks. "Even in these early days of the market's development, our wireless customers have saved millions of dollars by deploying a Sonus-based architecture. We anticipate wireless network operators to be a major driver of our business in 2007 and beyond."

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 comprehensive IP Multimedia Subsystem (IMS) solution, Sonus addresses the full range of carrier applications, including residential and business voice services, wireless voice and multimedia, trunking and tandem switching, carrier interconnection and enhanced services. Sonus' voice infrastructure solutions are deployed in service provider networks worldwide. Founded in 1997, Sonus is headquartered in Westford, Massachusetts. Additional information on Sonus is available at

For more information, please contact:

Sonus Investor Relations: US Media Relations:
Jocelyn Philbrook Sarah McAuley
978-614-8672 978-614-8745
[email protected]

EMEA Media Relations:
Paula Lender-Swain
+44 (0) 7808811586
[email protected]

Source: Sonus Networks, Inc.

CONTACT: Sonus Investor Relations, Jocelyn Philbrook, +1-978-614-8672, or [email protected], US Media Relations, Sarah McAuley +1-978-614-8745, or [email protected]; EMEA Media Relations, Paula Lender-Swain,
+44-7808811586, or [email protected]

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