Hi! I have encountered an application in the "real world" which provides port 9 in the SDP answer in the 200OK. The SDP m line indicates RTP/AVP. I recognize that port 9 is acceptable if the SDP m line indicates BFCP. My question is: Is port 9 acceptable for RTP/AVP. In other words, should the original offerer send an ACK and then immediate BYE indicating that it rejected the answer? Or....should the offerer send an ACK, then send media to port 8?
FYI. What I am actually seeing is that the answerer indicates port 9 in the answer but sends a re-INVITE immediately after the ACK; however, the originator/offerer does not accept the re-INVITE due to it is already in the process of tearing down the call. Has anyone else seen this specific behavior or similar behavior? P.S. RFC2327 noted a range of 1024-65535 for RTP ports; however, RFC4566 does not indicate a specific range. Regards, Tina Iliff
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