MILPITAS, CA and SAN FRANCISCO, CA - November 13, 2001 - IP Unity, provider of a carrier grade services platform for enhanced voice and telephony applications, and Indigo Software, a leading developer of SIP (Session Initiation Protocol) -based Internet communications infrastructure, today announced their mutual commitment to a new partnership. The alliance is geared towards offering telcos and service providers a comprehensive package to run Indigo's SIP-based applications on IP Unity's carrier grade media server platforms.

Indigo is known for its innovative set of Java-based SIP products including an ensemble of SIP servers, as well as their carrier class software development kit (SDK), the Indigo SIP Foundation Class^TM, which allows third party application developers to quickly construct SIP-based applications. These products are complemented by market-oriented end user solutions such as the Indigo CPL Editor^TM, which allows self-configuration of communications services, and the groundbreaking Indigo PIM (Presence and Instant Messaging) Client^TM - the only SIP-based non-proprietary instant messaging system on the market.

IP Unity's flagship product is the Harmony6000^TM Media Server, a platform providing the computationally intensive processing power required for enhanced voice applications such as unified messaging, interactive voice response and conferencing. The Harmony6000^TM effectively allocates media processing power between multiple applications, breaking the traditional one-application-per-box structure. This allows telcos and service providers to significantly reduce their operating expenses and increase revenues by offering a variety of services on the same platform.

With this partnership, Indigo Software and IP Unity will work in conjunction with third party application developers to integrate core SIP signaling systems with media-rich service platforms to ultimately deliver enhanced services such as unified messaging, web conferencing and Interactive Voice Response (IVR).

"This close collaboration allows both of our firms to extend our customer base and international visibility," said Edward Keegan, Head of Business Development at Indigo Software. "The synergistic combination of our software and IP Unity's state-of-the-art media server will provide a cost-effective platform for next-generation success."

"We are working with best-of-breed application developers such as Indigo to offer telcos and service providers a comprehensive set of enhanced voice services," said Brett Azuma, VP Marketing, IP Unity. "Working with Indigo puts us in the center of the SIP application development community, and we are committed to providing solutions based upon a wide variety of prominent call control protocols to meet the application demands of the carriers."

For further information, please contact :

Liz Scarborough Marketing Communications Manager IP Unity (408) 957-0800 lizs@ipunity.com

Geneviève Materne Head of Public Relations Indigo Software, Inc. +32 2 235 0957 genevieve@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. For more information, please visit http://www.cs.columbia.edu/sip

About IP Unity

Headquartered in Milpitas, CA, IP Unity delivers a carrier-grade services platform for enhanced voice and telephony applications over ATM, TDM and VoIP Networks. The company's media servers, applications servers, enhanced service applications, and application partners allow customers to quickly and cost-effectively offer new services associated with next-generation networks while protecting their investment in legacy systems. IP Unity has closed three rounds of funding with blue chip investors including Battery, New Enterprise Associates (NEA), Kleiner Perkins Caufield & Byers, Partech International, Firsthand Funds, Dresdner Kleinwort Wasserstein and Presidio Venture (Sumitomo Corporation). For more information, call 408-957-0800 or visit the company website at www.ipunity.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, please visit www.indigosw.com

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November 13, 2001 - IP Unity and Indigo Software Partner to Offer
Novel SIP Applications on Media Server Platform