Global IP Carriers –Stand No. 8

SWINDON, UK, April 21, 2005 – Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, today announced that it is participating in this year's Global IP Carriers 2005 conference being held 25 - 28 April at the Thistle Tower Hotel in London, UK.

Executives from Sonus Networks will offer delegates a view of the key threats and opportunities of VoIP. Sonus' founder and Chief Technology Officer (CTO) Mike Hluchyj will provide a perspective on what lies ahead for next generation networks.

Sonus speakers and topics scheduled to appear at the Global IP Carriers Convention include:

Monday, April 25, 2005, 10:00am - 4:00pm
Session: Pre-conference workshop: Understanding the opportunities and threats of VoIP
Speaker: Neil Kinder, Technical Director, Europe, Middle East & Africa (EMEA)

Thursday, April 28, 2005, 12:20pm - 12:50pm
Session: Harnessing new VoIP opportunities: what's ahead for next generation networks
Speaker: Mike Hluchyj, founder and CTO

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 Open Services ArchitectureTM (OSA), 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. Founded in 1997, Sonus is headquartered in Chelmsford, Massachusetts of U.S. Additional information on Sonus is available at http://www.sonusnet.com.

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