Voyant's ReadiVoice IP Conferencing System Deployed with Sonus in Touch America's VoIP Network; Sonus/Voyant Solution Enables Touch America to Offer On-Demand Conferencing Services

WESTFORD, Mass., and WESTMINSTER, Colo., April 22, 2002 – Sonus Networks (Nasdaq: SONS) and Voyant Technologies, Inc. today announced that Voyant has been named a Platinum Partner in Sonus' industry-leading partner initiative, the Open Services Partner AllianceSM (OSPA). To reach the Platinum level in the OSPA, partner companies must meet several criteria including deployment in a live, revenue-generating service provider network together with one or more Sonus products. National broadband carrier Touch America (NYSE: TAA) is offering IP-based conferencing services using Voyant's collaborative voice conferencing solution together with Sonus' packet voice infrastructure equipment.

"Customer focus is a main goal of Touch America, and this means providing communications connections easily and simply – anywhere, anytime," said John Real, director of product management for Touch America. "Our Business Anywhere Conferencing product uses the next-generation packet voice solution provided by Sonus and Voyant on our IP platform across 22,000 route miles of Touch America's broadband network. This allows us to rapidly and cost-effectively deliver on-demand conferencing services to customers, who just dial an access number and an optional account code to get connected. Business Anywhere combines the strengths of three leading-edge companies to provide robust and adaptable conference services that our customers want," he added.

Touch America has deployed its VoIP (voice over IP) network using the complete range of Sonus voice infrastructure solutions, including the GSX9000 Open Services Switch, the Insignus Softswitch and the Sonus Insight Management System. Sonus' award-winning packet voice solutions deliver toll-quality voice, system redundancy and the capacity to handle extremely large call volumes. Sonus' voice infrastructure solutions offer a single platform that allows carriers such as Touch America to support a host of communications services, including traditional long distance voice services, and enhanced services.

Touch America has also integrated Voyant Technologies' ReadiVoice IP collaborative voice conferencing solution into its IP platform to deliver Touch America's Business Anywhere Conferencing services. With Voyant's ReadiVoice IP, a reservationless, on-demand conferencing system, Touch America customers using Business Anywhere Conferencing services can initiate conference calls 24 hours a day, seven days a week, without having to make reservations or contact operators. The system offers subscribers convenient and easy access to conferencing services, and allows users to control calls using telephone touchtones or a Web-based interface.

"Touch America is focused on offering the most advanced technologies and services to keep up with the ever-changing communications needs of businesses users," said Terri Griffin, vice president, marketing, Sonus Networks. "With the SIP-based solutions provided by Sonus and Voyant, Touch America is delivering new services, such as reservationless conferencing, that build customer loyalty and drive minutes over Touch America's network. We are extremely gratified with the success of the Touch America network deployment, and are pleased that Voyant has attained Platinum Partner in the Sonus OSPA."

"Voyant is proud to reach Platinum status in the Sonus OSPA," said Michael Remacle, vice president, business development, Voyant Technologies. "Sonus has created a well-recognized partner alliance that has genuine influence on the enhanced services carriers implement today. The strength of the program has been validated in our cooperative affiliation with Touch America and their successful deployment of ReadiVoice IP."

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 is the first in the industry where product interoperability is verified, trial testing is performed and complete solutions are ultimately produced. To find additional information on the OSPA, including a list of all OSPA partners, log on to http://ospa.sonusnet.com.

About Voyant Technologies, Inc.

About Voyant Technologies, Inc. Voyant Technologies designs intuitively easier voice collaboration solutions for switched, wireless and IP networks. The company allows domestic and international carriers, LECs, CASPs, and next-generation carriers to integrate high-quality voice into every real-time communications application, such as web conferencing e-learning and other mission-critical business and wireless applications. In addition, Voyant's solutions are engineered for performance and flexibility, enabling customers to maintain a competitive edge with differentiating features and functionality. Voyant pioneered and patented reservationless conferencing - setting the industry standard for collaborative voice technologies to come. With over 220 customers worldwide, Voyant makes it easier for customers to integrate, operate and expand voice collaboration solutions to multiple endpoint devices. For more information about Voyant Technologies, visit www.voyanttech.com or call 888-447-1087. Voyant Europe Ltd can be reached at +44 (0) 1483 549011.

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network. With its Open Services Architecture (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.

This release may contain projections or other forward-looking statements regarding future events or the future financial performance of Sonus that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. Readers are referred to Sonus' 2001 Annual Report on Form 10-K, dated March 27, 2002 and filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. These risk factors include, among others, the adverse effect of recent developments in the telecommunications industry, the weakened financial position of many emerging service providers, Sonus' ability to grow its customer base, dependence on new product offerings, market acceptance of its products, rapid technological and market change and manufacturing and sourcing risks.

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