Microsoft KB Archive/308682

= RTP Port Allocation Does Not Obey RFC 1889 =

Article ID: 308682

Article Last Modified on 10/16/2002

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition

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This article was previously published under Q308682



SYMPTOMS
When you use NetMeeting through an Internet Security and Acceleration (ISA) server, you may encounter problems if another gatekeeper exists before the endpoint is reached. For example, you may observe that audio communications occur in one direction only.



CAUSE
When ISA server negotiates the ports for the Real Time Protocol (RTP), ISA server may decide to use a port numbered above the Real Time Control Protocol (RTCP) port. Although this port information is correctly passed over the control channel, some devices expect the port number to be below the RTCP port as defined in RFC 1889.



RESOLUTION
A fix is scheduled to be included in Service Pack 1 for Internet Security and Acceleration Server 2000.



STATUS
Microsoft has confirmed that this is a problem in Internet Security and Acceleration Server 2000.

Keywords: kbbug kbfix kbqfe KB308682

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