Windows Messenger (not MSN Messenger) for Windows XP supports SIP.

It supports Instant messaging, video and audio (telephony).

Valuable links:

• Windows Messenger Home Page
• Microsoft.com: Customizing windows messenger
• Windows Messenger 5.1 download
• Direct link without WGA
• SIP and NAT (MSDN network)

Windows messenger is part of the Microsoft Windows RTC (Real-Time Communications) framework and connect to Microsoft Live communications Server

Limitations:

• Windows Messenger 5.0 did not provide DTMF entry (needed to interact with Voice Mail systems). Do not know if this is fixed in v5.1.

See Also

• Asterisk phone Windows messenger
• Microsoft Portrait

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• VOIP Phones