Hi

I have a door telephone, with GSM fallback. Since telephone operators are going away from SS7, more and more traffic goes SIP.

Thus we now have some numbers where we can see that doing an invite with H.264 causes them to fail.

I have tried to remove coded 96 with sdp_remove_codecs_by_id, but it still leaves most of the video SDP in the invite.

SDP received by kamailio

Media Description, name and address (m): video 6100 RTP/AVP 96
Media Attribute (a): rtcp:6101 IN IP4 192.168.237.239
Media Attribute (a): rtpmap:96 H264/90000
Media Attribute (a): fmtp:96 profile-level-id=42000d;packetization-mode=1
Media Attribute (a): sendrecv

After sdp_remove_codecs_by_id I send this. But without "96"

Media Description, name and address (m): video 6534 RTP/AVP

Media Attribute (a): sendrecv
Media Attribute (a): rtcp:6535
Media Attribute (a): ice-ufrag:35ZngQdL
Media Attribute (a): ice-pwd:DG6kUbcYwBFKNS6YzCG27wRlG4
Media Attribute (a): candidate:r9KO0wNPMTGktklS 1 UDP 2130706431 192.168.237.15 6534 typ host
Media Attribute (a): candidate:r9KO0wNPMTGktklS 2 UDP 2130706430 192.168.237.15 6535 typ host

My problem is that the door telephone does not do an ACK when it gets the 200 OK

My suspicion is that it does not understand the video response

Media Description, name and address (m): video 0 RTP/AVP 0
Media Attribute (a): ice-ufrag:35ZngQdL
Media Attribute (a): ice-pwd:DG6kUbcYwBFKNS6YzCG27wRlG4
Media Attribute (a): sendrecv

Is there a way to remove the whole video part and not just the coded id?

It is not an option to disable video in the door telephone, as we need the video. It is just in the fallback is must be removed.

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