5 billion).
Mitel phones have long supported both SIP and Mitel IP (MiNET) protocols
on a single hardware platform .

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"This agreement reinforces AT+T's position as a global
networking company focused on serving business customers and shows that
companies trust AT+T as their global IT partner and networking integrator of
choice.

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"We are delighted to provide a leading global company such as Saint Gobain
with our extensive network expertise, products and services across multiple
territories," said Bill Archer, head of AT+T's sales team for Europe, the
Middle East and Africa .

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Backed by the research and
development capabilities of AT+T Labs, the company is a global leader in
local, long distance, Internet and transaction-based voice and data services. Native SIP Support , trunking and interconnection to third-party wireless
on Flagship Mitel 3300 IP Communications Platform

OTTAWA, ON and SAN JOSE, CA (VON Spring), March 14
- Mitel(R), the trusted provider of IP communications solutions and
applications for growing enterprises, has extended its industry leadership in
delivering the full value of networked business solutions with native support
of the Session Initiation Protocol (SIP) in the latest release of the Mitel
3300 IP Communications Platform (ICP). "We view SIP as the enabler
of interoperability and this release allows the 3300 ICP to interconnect with
soft-switch vendors that represent more than 90 percent of the soft-switch
market as well as offering support for SIP endpoints and applications.

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AT+T's IP VPN enables Saint Gobain to manage its vast global distribution
network, monitor inventory around the globe, support its worldwide brand-
building strategy and provide employees with secure, high-speed, online access
to corporate databases and proprietary applications, including sales,
marketing, manufacturing and supply-chain systems, while reducing operating
costs."
The AT+T network-based IP VPN solution service uses Multi-Protocol Label
Switching (MPLS) protocol in the backbone, automatically providing Saint
Gobain with the flexibility of any-to-any connectivity across sites and class
of service functionality allowing the company to prioritize different types of
data traffic over one common infrastructure ensuring high levels of
performance, cost efficiency and robust levels of security.

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Saint Gobain is listed on the stock markets in Paris, London,
Frankfurt, Zurich, Brussels and Amsterdam.

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Saint Gobain provides insulation for one-fifth of all homes in the United
States and glass for half of all cars in Europe. With a focus on the user experience, the company delivers
advanced communications solutions that are easily customized for individual
business needs.

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Mitel Extends IP Interoperability Leadership

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Under the terms of the agreement, AT+T will provide an Internet Protocol
Virtual Private Network (IP VPN) integrating 220 locations in the United
States and 30 sites in Japan and Korea.

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"Complementing our broad suite of IP communications solutions, the
addition of native SIP support on the 3300 ICP enables customers to take full
advantage of their investment in a multi-vendor environment," said
Ron Wellard, vice president, product development.mitel.

NOTE TO EDITORS: Mitel has completed or is in the process of completing
SIP interoperability testing with a number of softswitch, firewall and IP-
PBX vendors including: Asterix, Broadsoft, Cedarpoint, Cisco , Cirpak,
Huawei, Ingate SIP aware firewall, IX67 SIP aware firewall, KIRK 1200,
Microsoft , Newport Networks, Nortel, Radvision, Samsung, Siemens, and
ZTE.

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PARIS, AT+T has won a three -year, $8. The company has a presence in
more than 50 countries, employs 180,000 staff and has sales of euro 32 billion
($41. It's flexibility and scalability make tasks such as quick
conferencing and instant messaging easy and cost effective. Customers are provided with innovative
ways to leverage their resources and migrate to the benefits of IP
communications at their own pace.

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Additionally , SIP connectivity to
Microsoft(TM) Office Communicator for softphone, presence and collaboration
functionality and third-party call control inter-working with Microsoft Live
Communications Server is enabled using SIP, CSTA and XML.

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5 million
global data networking deal from Saint Gobain, one of the world's largest
manufacturing firms, with more than 1,200 consolidated subsidiary companies in
50 countries worldwide.
Mitel's newly introduced Live Business Gateway enables enterprises to
implement IP-based solutions through a smooth, intelligent evolution.

The names of actual companies and products mentioned herein may be the
trademarks of their respective owners.

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Mitel is headquartered in Ottawa, Canada
with offices, partners, and resellers worldwide.

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com.

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Microsoft has adopted SIP for its Live Communications Server product and
Windows Messenger(TM), as well as AOL and many others for instant messaging.

About SIP

SIP, an Internet Engineering Task Force (IETF) standard, is an open, peer-
to-peer Internet-genuine protocol for establishing and managing multi-party,
mixed-media sessions over converged networks.

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http://www. Working
in conjunction with Microsoft Office Live Communications Server, a SIP-based
presence and collaboration server, the Mitel / Microsoft partnership delivers
advanced applications for global communication and collaboration. SIP enables the creation and
deployment of feature-rich services that go far beyond simple IP telephony
phone calls.

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About AT+T:
For more than 125 years, AT+T (NYSE: T) has been known for unparalleled
quality and reliability in communications.

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St. Gobain Signs $8 .5 Million Contract for AT+T Global Networking Solution

"
Mitel enables users to fully leverage the power and feature functionality
of the 3300 ICP through generic SIP endpoints and innovative use of existing
hunt group and HotDesking functionality.

About Mitel

Mitel is a market leader for voice, video, and data convergence over
broadband networks. Mitel solutions extend from intuitive desktop appliances and
applications through to Applications + Services Gateways that enable business
process integration and enhancement. For more information please
visit http: //www.