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Old 5th December 2008 | 11:12
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Saab Dastard
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Joined: Mar 2001
: PPL
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From: Twickenham, home of rugby
Use the registry to specify the port or part range:

Description of the Windows Messenger client basic protocol port usage for instant messaging, file transfer, audio, and video

Audio and video

Audio uses a pair of User Datagram Protocol (UDP) ports for a Real-time Protocol (RTP) stream to transmit data. Video uses Real-time Transport Protocol (RTCP) to control the session stream.

By default, the ports that are used are dynamic. However, the ports can be controlled through Group Policy registry settings.
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