The code needs to be updated to be able to catch `a=rtcp-fb:`, probably it was not a
common attribute when the sdp parser was written and not covered at that time (iirc, it
was @ovidiusas writing the sdp parser).
The solution right now is to use `subst_body()` function to remove lines from sdp matching
`a=rtcp-fb:ID`, replacing the ID with the corresponding codec numeric ids:
*
https://www.kamailio.org/docs/modules/stable/modules/textops.html#textops.f…
If you do not want video media stream, there is a function to remove it all together:
*
https://www.kamailio.org/docs/modules/stable/modules/sdpops.html#sdpops.f.s…
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