SAN FRANCISCO, CA - October 16, 2001 - Leading SIP communications software developer, Indigo Software, today announced at Fall 2001 Voice On the Net^TM, the release of the Indigo SIP Foundation Class^TM, a Java-based software development kit (SDK) aimed at providing a powerful set of tools for the speedy construction of SIP (Session Initiation Protocol) network elements.

The foundation of a second generation software architecture, the re-defined Indigo SDK consists of multi-platform Java APIs that support SIP, CPL (Call Processing Language) and PhoneCTL (Phone Control protocol), as well as Presence and Instant Messaging extensions of SIP. This market-first is designed as a low level SIP stack and provides a strong basis for the development of SIP-based client and server applications.

"This robust and optimized stack distinguishes itself from the competition through its inherent extensibility to support higher level protocols," said Pierre-André Rulmont, Head of Product Management at Indigo Software. "In addition to its multiplatform support, the product positions itself in the market as the only carrier-class SIP stack that has fused all the recent developments and refinements that we have seen around SIP this year."

The Indigo SIP Foundation Class^TM is generally available and is delivered as a complete SDK package containing all the necessary tools for advanced third-party development. It includes a comprehensive documentation set composed of sample code, an HTML based reference guide and a developer guide.

For further information, please contact :

Edward Keegan Indigo Software, Inc. +32 2 235 09 45 edward@indigosw.com

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, visit www.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.

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October 16, 2001 - INDIGO SOFTWARE ANNOUNCES AVAILABILITY OF INDIGO SIP FOUNDATION
CLASS^TM, KERNEL ELEMENT OF ITS SECOND GENERATION ARCHITECTURE