FOR IMMEDIATE RELEASE

For more information, please contact:

Sonus Investor Relations:
Jocelyn Philbrook
978-614-8672
jphilbrook@sonusnet.com		 Sonus Media Relations:
Sarah McAuley
212.699.1836
smcauley@sonusnet.com		 Belkin Media Relations:
Melody Chalaban
310 604-2347

SONUS NETWORKS AND BELKIN DEMONSTRATE RING TONE SERVICE FOR VOBB SUBSCRIBERS

CHELMSFORD and BOSTON, Mass., September 19, 2005 – September 19, 2005 – Today at the Fall VON 2005 Conference, Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, and Belkin International, Inc., the global leader in connectivity solutions, announced that they will be demonstrating a new ring tone service in the Belkin booth (#11). The service, which leverages the seamless interoperability between the Sonus-branded line of Belkin’s VoIP broadband phone adapters and Sonus’ industry leading ASX™ Access Server, offers consumers the ability to assign distinctive ring tones for incoming calls. Sonus and Belkin announced their formal partnership in May 2005, which included a mutual commitment to extensive interoperability testing in order to streamline the process for consumers setting up and using a consumer VoIP system

“The next generation of services centers on the ability to customize the way we communicate,” said Steve Edwards, chief marketing officer, Sonus Networks. “Ring tones have been hugely popular in the mobile phone industry, and through our partnership, Sonus and Belkin are making it easy for consumers to take advantage of a broad array of new services that are enabled by voice over broadband solutions.”

“Attracting new customers through enticing services, while at the same time making voice over broadband solutions easy to use, is key to propelling the adoption of VoBB solutions further into the mainstream,” said Mark Reynoso, Belkin Sr. VP of Sales and Marketing. “One of the key benefits of VoBB solutions is that services that consumers are accustomed to for one device, such as ring tones for mobile phones, are now available for home or office lines.  By selecting a solution backed by the Sonus and Belkin brands, consumers can rest assured that setting up and managing the service is simple and straightforward.”

Deployed in some of the world’s largest VoBB service providers around the world, Sonus’ ASX Access Server supports packet connectivity to a variety of Integrated Access Devices (IADs), gateways, next-generation Digital Loop Carriers (DLCs) and IP endpoints. As a pioneer in the application of Session Initiation Protocol (SIP), Sonus designed the ASX as an open system that leverages SIP as its core protocol for communicating between network elements. The ASX enables a broad range of traditional class 5 telecom services, including residential access, cable access and business services, as well as a variety of new features available only on packet based networks such as unified messaging, multi-media conferencing and desktop integration capabilities.

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 Chelmsford, Massachusetts of U.S. Additional information on Sonus is available at http://www.sonusnet.com.

About Belkin International, Inc.
Belkin International, Inc., the global leader in connectivity solutions, offers a range of innovations for the computer, electronics, and mobile consumer. With a diverse and far-reaching product mix consisting of home and enterprise networking, audio video solutions, KVM (keyboard/video/mouse) and peripheral sharing, power protection and cabling, as well as USB and FireWire® devices, Belkin extends its reach also to Bluetooth™ ,cellular, PDA, iPod®, and other solutions for mobile computing. Belkin products are available through www.belkin.com as well as through a network of major distributors, resellers, and superstores.