Hi, I am using rtpengine to proxy audio to/from media servers. The outbound calls are being rejected by a couple of my carriers (although accepted by others), and the closest that I have been able to find for the reason is the inclusion of “a=rtcp:xxxxx” in the SDP generated by rtpengine. To test further, I am trying to remove this line.  Rtpengine itself doesn’t have any options to remove it, so I am left with manipulating the generated SDP in Kamailio.

Hi,   I am using rtpengine to proxy audio to/from media servers.   The outbound calls are being rejected by a couple of my carriers (although accepted by others), and the closest that I have been able to find for the reason is the inclusion of “a=rtcp:xxxxx” in the SDP generated by rtpengine.   To test further, I am trying to remove this line.  Rtpengine itself doesn’t have any options to remove it, so I am left with manipulating the generated SDP in Kamailio.   A sample of generated SDP is: a=maxptime:150 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:18 annexb=no a=fmtp:101 0-16 a=sendrecv a=rtcp:30939 s=My Media Server   I am using rtpengine_manage("RTP/AVP ICE=remove"); to generate the SDP to a variable ($avp(sdp))   Now, I am trying to just remove the whole a=rtcp line with re.subst   $avp(sdp)=$(avp(sdp){re.subst,|a=rtcp:[0-9]*\R||s});   *** Tried / as delimiter also, but | looks cleaner *** This should match the line and any CR/LF characters – BUT in results, nothing is changed (various online Regex testers show this match to be correct – I tried \r\n also).   If I do the same but without the \R, then the line is removed but not the CR/LF, leaving a gap in the SDP – which is invalid. $avp(sdp)=$(avp(sdp){re.subst,|a=rtcp:[0-9]*||s});   Gives: a=maxptime:150 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:18 annexb=no a=fmtp:101 0-16 a=sendrecv   s=My Media Server     Can anyone see where I am going wrong, or suggest an alternative?   Kind Regards, Mark Hall     _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users