Microsoft Messenger

Microsoft Messenger version 4.6 for Windows XP and 2000 supports SIP voice and video calls. To set up SIP calls:

1. Go to Tools/Options/Accounts menu.
2. Check Communication service.
3. Fill in your SIP address-of-record, e.g., alice@example.com.
4. In the Advanced menu, check Configure setting and set the server to your SIP server.

To make a call

1. In Actions menu, choose Start voice/video conversation.
2. Choose Other tab and input the SIP address, e.g. bob@elsewhere.edu.

See also: Windows Messenger: New Waves of Innovation; Windows Messenger Feature in Windows XP Will Usher In the Age of "Real-Time Communication"

Only versions > XXX support SIP Digest authentication.

Application sharing does not work for "guest" accounts.