European Competitive Telecommunications Association

WESTFORD, Mass., April 23, 2008 - Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of IP communications infrastructure solutions, today announced that Convergia Networks, a world-class provider of voice, data, and Internet services for residential, business and wholesale customers, with offices throughout North America, South America and Europe, has selected Sonus solutions as the new backbone of its international network.

Convergia selected Sonus to differentiate its service offerings, while ensuring the highest level of performance for its global customer base. Convergia will deploy Sonus' Access solution, including its recently released IMX 2.0 Multimedia Applications Platform, to deliver its ever expanding customer base with advanced residential and enterprise voice services. Sonus' solution will enable Convergia to deliver on its vision of quality residential and business service without geographic boundaries.

"Our customers demand uncompromised network performance. For Convergia, customer satisfaction is paramount to our success. At the same time, we needed to differentiate our service with unique features and functionality that the IMX 2.0 can deliver," said Alejandro Bitar, president at Convergia Networks. "The decision for us was clear: Sonus was the best solution for quality of service, scalability and reliability; and all within a network environment that is easy to operate and maintain."

Convergia's replacement of its current platform will allow Convergia to increase the performance of its network, improve customer satisfaction, reach new geographic regions and to deliver increased services. Through Sonus' unparalleled CODEC capabilities, Convergia will be able to further improve bandwidth management and increase the overall utilisation of its IP network. Further, by integrating advanced service functionality with flexible and robust call performance quality, Sonus' IP-Voice platform will play an integral role with respect to offering the highest quality services to Convergia's customers.

"Convergia Networks has developed one of the most comprehensive, global, end-to-end telecom networks," said Mohammed Shanableh, vice president of worldwide sales, Sonus Networks. "We share a vision of bringing innovative solutions, whether wireline, wireless or integrating both. We are proud to assist Convergia in meeting its goals of global deployment, connectivity and leading edge next generation services."

In addition to Sonus' IMX 2.0, Convergia will also deploy the Sonus GSX9000TM and GSX4000TM Open Services Switches, the PSX™ Call Routing Server, and the ASX™ Feature Server.

About Convergia Networks
Convergia Networks ( is a world-class provider of voice, data, and Internet services for residential, business and wholesale customers. Via our state-of-the-art switching facilities and end-to-end network, our company presents the fullest potential of today's broadband revolution. By introducing leading edge and innovative products and services, establishing global alliances, and always striving to improve our existing business, Convergia Networks is delighting our customers worldwideTM.

About Sonus Networks
Sonus Networks, Inc. is a market leader in IP communications infrastructure 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:
U.S. Media Relations: 
Lucy Millington
+1 978-614-8240
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Investor Relations: 
Jocelyn Philbrook
+1 978-614-8672
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