SONUS Networks Welcomes New Partners Into OSPA

WESTFORD, MA--September 10, 2003--Sonus Networks (Nasdaq: SONS), a leading provider of carrier packet voice infrastructure solutions, today announced that Intelis Inc., RADVISION Ltd. (Nasdaq: RVSN) and Vero Systems have joined Sonus' Open Services Partner AllianceSM (OSPA).

"The OSPA brings Sonus together with leading telecom hardware and software vendors providing a range of products such as enhanced services applications, network infrastructure and operations support systems (OSS)," said Michael O'Hara, vice president, marketing, Sonus Networks.  "We are pleased to work with the companies entering the program today to expand the solutions options available to carriers."

• Intelis offers the Intelis Enhanced Operator Services (EOS) platform, a fully-featured Operator Services solution that completes, tracks and rates toll calls billed via BOC card, credit card, collect, third party or sent paid (bill to ANI).  The Intelis EOS features a user-friendly administration system and a flexible GUI-based IVR to enable service customization. The EOS also integrates seamlessly with third party Directory Assistance applications. www.intelis-inc.com
  
  
• RADVISION delivers the viaIP videoconferencing product family, a complete set of multipoint conferencing units, data collaboration, gateways, gatekeepers (ECS), utilities and applications for rich media collaborative communications in large-scale enterprise, carrier and distributed network deployments. www.radvision.com
  
  
• Vero Systems provides the Acuite AcuRoute Automated Optimal Routing solution.  An integrated solution, AcuRoute maximizes the per call margin through the automation of Least Cost Routing (LCR) across on-net and off-net carriers.  Additionally, AcuRoute improves customer satisfaction and call completions through timely and accurate NPA/NXX updates and provides immediate realization of cost savings due to minimized requirements for technicians. www.verosystems.com
  

About Sonus' OSPA
Sonus Networks' Open Services Partner Alliance program provides a framework that offers service providers end-to-end packet-based network solutions using best-of-breed technologies and applications.  The goal of the OSPA is to empower standards-based interoperability between applications, hardware vendors, and the Sonus product family.  An integral part of the Sonus OSPA, the OSPA Interoperability Laboratory verifies product interoperability, performs trial testing and ultimately produces complete solutions.  To find additional information on the OSPA, including a list of all OSPA partners, log on to http://www.sonusnet.com/partners/index.html.

About Sonus Networks
Sonus Networks, Inc., is a leading provider of packet voice infrastructure solutions for wireline and wireless service providers.  With its Open Services ArchitectureÔ (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking, residential access and Centrex, tandem switching, and IP voice termination, as well as enhanced services.  Sonus' award-winning 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 Westford, Massachusetts.  Additional information on Sonus is available at http://www.sonusnet.com.