SAN FRANCISCO, CA - May 29, 2001 - Indigo Software, a pioneering Internet-infrastructure software developer, announced today that it has joined the Sonus Networks (Nasdaq: SONS) Open Services Partner Alliance^TM (OSPA). Designed to provide a framework that offers service providers end-to-end packet-based network solutions, Sonus' OSPA aims to empower standards-based interoperability between applications, hardware vendors, and the Sonus product suite. Indigo will bring to the program the latest versions of its SIP user agent and SIP proxy server, as well as other key network components.

"We are pleased with the way our alliance has created so much interest in the telecom industry. Indigo's involvement illustrates the extent to which the program has attracted top companies that want to work with Sonus in promoting packet voice technology such as Indigo's SIP-based software and development tools," said Terri Griffin, Vice President of Marketing Programs, Sonus Networks. "Along with Indigo and other partners, we are focused on helping carriers provide next generation services to end users."

"We are delighted to lend our support to this initiative to further the development of standards-based interoperability between communications infrastructure providers," said Edward Keegan, Head of Business Development at Indigo Software. "The OSPA helps speed up the delivery of our innovative new products to the carrier market."

The Indigo Software product offering is a complete suite of SIP-centered software and development tools meeting the exacting communications industry requirements of reliability, scalability and performance. Indigo will be a featured participant in the Sonus Networks OSPA Live Demo at Supercomm 2001 in June.

For further information, please contact :

Edward Keegan Head of Business Development Indigo Software +32 2 235 09 45 edward@indigosw.com

About Session Initiation Protocol (SIP)

An Internet Engineering Task Force (IETF) standard, SIP is an open, Internet-genuine protocol for establishing and managing multi-party, mixed-media sessions over converged networks. SIP enables the creation and deployment of feature-rich services that go far beyond simple VoIP calls. More information about SIP can be found at http://www.cs.columbia.edu/sip

About Indigo Software

With operations in both the US and Europe, Indigo Software is a forward-thinking software developer, architecting new Internet communications solutions for a broad range of service providers, including ISPs, communications ASPs, IP carriers and Next-Gen operators. Capitalizing on its award-winning, expandable communications software framework, Indigo provides a unique ensemble of Internet-infrastructure software components based on Session Initiation Protocol (SIP) and other Internet-genuine technologies sharing SIP's endowments. Devising unprecedented communications software solutions for converged networks, Indigo gives an ever-expanding service providers market the power to transform the experience of integrated communications for a generation of customers with Internet savvy. For more information, please visit www.indigosw.com

About Sonus' OSPA

Founded on the combination of Sonus' Open Services Partner Alliance (OSPA) Program and the INIP PoweredSM Partner Program from the acquisition of telecom technologies, Inc., the OSPA has gained significant industry momentum, with membership of more than 130 leading independent vendors. The OSPA 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 suite. An integral part of the Sonus OSPA, the Interoperability Laboratory is the first in the industry where product interoperability is verified, trial testing is performed, and complete solutions are ultimately produced. Additional information on the OSPA is available at http://ospa.sonusnet.com

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May 29, 2001 - Indigo Software Teams with Sonus Networks
to Bring Forward Delivery of SIP Infrastructure Solutions