CHELMSFORD, Mass., September 28, 2005 -Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, announced today that company executives will be presenting at this year's INTERNET TELEPHONY® Conference & EXPO, held in Los Angeles, CA, October 24-27, 2005.

Bob Dye, Vice President, Strategy for Sonus Networks will speak in the session titled, “A Look Ahead: The Future of IMS” taking place Monday, October 24th from 4:00-4:45 pm. Sonus Networks was recently recognized by the 2005 Frost & Sullivan Technology Innovation Award for its industry-leading IMS solution.

Mohammed Shanableh, Vice President, Network Technology Solutions at Sonus Networks, will also be speaking at this year's conference. Shanableh will be participating in the session titled, "Migrating to VoIP: A Service Provider Round Table" on Thursday, October 27th from 12:15-2:00 pm.

INTERNET TELEPHONY® Conference & EXPO, held October 24-27, 2005, is the world's largest and best-attended VoIP trade show. Last February, the show drew over 6,200 buyers and sellers of VoIP products and services to Miami. For this upcoming October show, TMC projects total attendance to exceed 7,500.

About TMC®

Technology Marketing Corporation (TMC) publishes two print magazines: Customer Inter@ction Solutions, and Internet Telephony; five digital publications, SIP Magazine, Speech-World, WiFI Telephony Magazine, VoIP Developer, WiMAX Magazine; and the online publications TMCnet.com, Planet PDA Magazine, WiFi Revolution, Alternative Power and BiometriTech. TMC is also the first publisher to test new products in its own on-site laboratories, TMC Labs. TMC also produces The VoIP Developer Conference, Speech-World Conference, IP Contact Center Summit and The Global Call Center Outsourcing Summit. TMCnet.com publishes more than 20 topical online newsletters. For more information about TMC, visit its Web site at www.tmcnet.com.

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. Additional information on Sonus is available at http://www.sonusnet.com.

Sonus is a registered trademark of Sonus Networks. All other company and product names may be trademarks of the respective companies with which they are associated