INFO: Port Number Allocation When Passing over TCP/IP

ID: Q187596

The information in this article applies to:

• Microsoft NetMeeting 2.1 Software Development Kit (SDK)

SUMMARY

What specific port number can be used for the NetMeeting audio and video traffic when passing over a Firewall?

In H.323, the standard protocol that NetMeeting uses for audio and video, only the first port number (1720) is static. After the initial connection, a dynamically assigned TCP port number is negotiated for some more control data to be exchanged. Following that, dynamic User Datagram Protocol (UDP) ports are negotiated for the actual exchange of media. There is no way to configure NetMeeting to use a specific port because this dynamic negotiation is part of the H.323 standard.

Additional query words:

Keywords          : kbNetMeeting kbSDKNMeet210 kbSDKPlatform kbfaq
Version           : 2.1
Platform          : WINDOWS winnt
Issue type        : kbinfo

Last Reviewed: December 17, 1998