Ottawa, Canada and San Francisco, CA - October 31, 2001 - Mitel Networks, a leading edge provider of IP communications solutions, and Indigo Software, a pioneer in the development of SIP-based network infrastructure, today announced successful interoperability at the desktop. The Mitel Networks 5055 SIP Phone demonstrated total interoperability with Indigo's SIP Proxy Server and received high marks in all categories during testing conducted at Technology Marketing Corporation's ConvergeNET^TM event at the 2001 Internet Telephony Conference and Expo in San Diego, CA. The ConvergeNET platform provides the means to interface various gateways, gatekeepers, SIP Proxy servers and SIP end points to examine their degree of standards compliance and interoperability.

"Mitel Networks is leveraging a nearly 30-year pedigree of success at the desktop to deliver robust, feature-rich SIP devices and peripherals," said Ray Brown, Vice President, Portfolio Management, Mitel Networks. "Through the continued successful interoperability of the 5055 SIP Phone with such leading vendors as Indigo, Mitel is proving that it's poised for vanguard leadership in the delivery of SIP at the desktop."

Mitel Networks 5055 SIP Phone is the first member of Mitel's SIP desktop portfolio and is currently in field trials. The 5055 SIP Phone boasts the same voice quality, feature set and ergonomics of a Mitel Networks 5020 IP Phone and delivers further on a commitment to no-compromise IP-based devices at the desktop.

"A key value proposition of SIP is based around vendor interoperability, allowing enterprises to choose the components for a customized communications solution," said Ed Keegan, Head of Business Development, Indigo Software. "Through proving seamless interoperability at ConvergeNET, Mitel Networks has shown that it has the acumen to take advantage of the burgeoning opportunities presented by SIP delivery in the enterprise."

A flagship among the Indigo product suite, the award winning Indigo SIP Proxy Server^TM allows the negotiation, management and termination of real time, mixed-media sessions between any SIP entities. Based entirely on Java, the product supports cross-platform compatibility, ensures faster development and guarantees high-quality applications.

For further information, please contact :

Jon Carvill Mitel Networks (978) 443 7099 jon_carvill@mitel.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.

About Mitel Networks

Mitel Networks is a leading provider of next-generation IP telephony solutions and a market-leader for voice, video and data convergence. The company creates advanced communication solutions and applications in the area of speech recognition, wireless mobility, unified messaging, and contact center solutions. Mitel Networks is committed to delivering integrated business solutions to the hospitality, education, health care, government, retail and financial markets. The company is headquartered in Ottawa, Canada and supports its customers through offices and partners worldwide.

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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October 31, 2001 - Mitel Networks and Indigo Software Demonstrate
SIP Interoperability at the Desktop