European Competitive Telecommunications Association

STAINES, UK., June 17, 2008 – Sonus Networks (Nasdaq: SONS) the market leader in IP communications infrastructure, today unveiled a complete voice solution that leverages the power of WiMAX networks to meet the unique goals of mobile broadband networks. Fully integrated and tested, the Sonus WiMAX solution promises to help operators quickly and profitably deploy voice services over their mobile broadband networks today, while getting ready for the future with 4G networks, including mobile interactive multimedia services. This voice architecture combines Sonus’ leadership in IP-voice technology and the Sonus Activator.

Sonus’ WiMAX solution leverages the IEEE 802.16 WiMAX standard that delivers wireless last mile access for fixed broadband services, similar to DSL or cable modem service. The Sonus WiMAX solution includes Sonus ASX, GSX, PSX, EMS, NBS and Activator that have already been proven in operators’ networks around the globe and are being relied upon for real-time voice services today.

In more mature economies, operators are embracing WiMAX technology to compete against local incumbents. With the Sonus WiMAX solution these operators are now ready to deliver a complete digital package to consumers.

“At the end of 2007 there were just over 2 million WiMAX subscribers globally.That number is expected to grow to nearly 80 million by the end of 2010. The ability to add a toll quality voice service to the operators’ service increases the likelihood that operators will experience even further acceleration,” said Richard Webb, Directing Analyst, WiMAX, WiFi, and Mobile Devices with Infonetics research. “In more mature economies, voice based WiMAX services could significantly change the winners and losers in the region. Sonus’ entrance into the market is a positive change for carriers.”

Today the world’s most powerful economies operate with an “always-on” mantra. Consumers and enterprises are demanding an ever increasing number of services and higher bandwidth speeds from their operators. To compete in today’s global market, the ability to access the Internet and communicate is critical. Based on a standard WiMAX connectivity, the Sonus solution delivers all the capabilities individuals are accustomed to receiving via a fixed-line network, but with the benefits of IP.

“At Sonus, our mission is to change the way the world communicates. We strive to bring families, friends and colleagues closer together,” said Jocelyn Philbrook, vice president, corporate marketing and investor relations. “With Sonus WiMAX, we are not only able to do that, but also to help bring world class communications to many emerging markets.”

“It is apparent that WiMAX will be a key technology in the next generation of network solutions,” said Vikram Saksena, CTO, Sonus Networks. “Sonus is committed to developing wireless solutions that will leverage the benefits of the WiMAX network and integrate with the world’s historic telephony networks. Our new mobilEdge product and the Sonus Activator are proof of this commitment, allowing Sonus to offer a solution that incorporates service fulfillment, a crucial component in enabling operators to get to market faster and more quickly achieve return on their WiMAX investment.”

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About Sonus Networks
Sonus Networks, Inc. is a leading provider of IP-voice 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 Media Relations: 
Lucy Millington
+1 978-614-8240
This email address is being protected from spambots. You need JavaScript enabled to view it.

Sonus Investor Relations: 
Jocelyn Philbrook
+1 978-614-8672
This email address is being protected from spambots. You need JavaScript enabled to view it.This email address is being protected from spambots. You need JavaScript enabled to view it.

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