CommunicAsia 2005 Booth #3H2-04

CHELMSFORD, Mass., June 13, 2005 – Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, today announced that it will showcase its latest technology introductions and detail how its solutions provide a seamless migration to an IP Multimedia Subsystem (IMS) architecture in its exhibit at CommunicAsia 2005. The CommunicAsia 2005 summit will be held from June 14-16, at the Raffles City Convention Centre in Singapore, with the exhibitions held at the Singapore Expo from June 14-17.

In addition, Sonus vice president of Asia Pacific, Simon Naylor, will be delivering a presentation that will explore the carrier VoIP market, highlighting the current realities and opportunities. Details of the session are as follows:

Wednesday, June 15, 2005, 11:15am - 11:45am
Topic: Carrier VoIP - Realities and Opportunities
Speaker: Simon Naylor, Vice-President, Asia Pacific, Sonus Networks, Inc.

CommunicAsia 2005 is Asia's most established and comprehensive Communications & IT event. It is an international showcase of the latest innovations and provides networking opportunities for ICT professionals. Additional information on CommunicAsia 2005 can be found at: www.communicasia.com.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice over IP (VoIP) infrastructure solutions for wireline and wireless service providers. Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking and tandem switching, residential and business access, network border switching and enhanced services. Sonus' voice infrastructure solutions, including media gateways, softswitches and network management systems, are deployed in service provider networks worldwide. Sonus, founded in 1997, is headquartered in Chelmsford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

Sonus is a registered trademark of Sonus Networks. Open Services Architecture, GSX9000 and Insignus are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.