Why I am seeing messages like “RTP Packet from SSRC=xxxxxxxx ignored, expecting SSRC=yyyyyyyy” with audio only in one direction?
The one-way audio and the warning message are caused by the endpoint changing the RTP SSRC identifier in the middle of a call. While strictly speaking this is not illegal, it is a strange thing for the endpoint to do as this makes the endpoint look like a hostile endpoint is attempting to insert audio into the session. Unfortunately, some endpoints do change the SSRC identifier mid-call and by default OpenH323 will detect the condition and ignore the new data. The warning message above will be displayed when this condition occurs. If you need to interoperate with endpoints that change SSRC mid-call, you can disable the checking of SSRC identifiers by editing the file openh323/src/rtp.c.
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