For example calling from kamailio config file
`rtpengine_answer("SDES-off ICE=remove trust-address replace-origin
replace-session-connection UDP/TLS/RTP/SAVP");` will result in passing
"UDP/TLS/RTP/SAVP" to rtpengine as an undefined flag instead of interpreting it
as a valid transport protocol.
Relevant entry form rtpengine log:
`Feb 14 04:55:20 rtpengine[27464]: DEBUG:
[ct5Atc9TLOVPwKPDYBHPdwDz@y94Z4s9yJ1MvK7XDiiI7vbC3]: Dump for 'answer' from
127.0.0.1:57578: { "sdp": "`
` v=0`
` o=- 3727601701 3727601702 IN IP4 10.10.1.145`
` s=pjmedia`
` c=IN IP4 162.253.31.67`
` b=AS:1974`
` t=0 0`
` a=X-nat:0`
` m=audio 18228 RTP/AVP 8 0 9 101`
` c=IN IP4 162.253.31.67`
` b=TIAS:64000`
` a=rtcp:18229 IN IP4 162.253.31.67`
` a=sendrecv`
` a=rtpmap:9 G722/8000`
` a=rtpmap:8 PCMA/8000`
` a=rtpmap:0 PCMU/8000`
` a=rtpmap:101 telephone-event/8000`
` a=fmtp:101 0-15`
` m=video 18344 RTP/AVP 99 34`
` c=IN IP4 162.253.31.67`
` b=TIAS:1800000`
` a=rtcp:18345 IN IP4 162.253.31.67`
` a=sendrecv`
` a=rtpmap:34 H263/90000`
` a=fmtp:34 CIF4=1;CIF=1;QCIF=1;SQCIF=1`
` a=rtcp-fb:* nack pli`
` a=rtcp-fb:* nack`
` a=rtcp-fb:* ccm fir`
` a=rtcp-fb:* ccm tmmbr`
` a=rtpmap:99 H264/90000`
` a=fmtp:99 profile-level-id=42001f;
packetization-mode=1;max-br=1800`
` m=text 0 RTP/AVP 105 102", `
` "ICE": "remove", `
` "flags": [ "SDES-off", "trust-address", "UDP/TLS/RTP/SAVP" ], `
` "replace": [ "origin", "session-connection" ], `
` "rtcp-mux": [ "demux" ], `
` "call-id": "ct5Atc9TLOVPwKPDYBHPdwDz@y94Z4s9yJ1MvK7XDiiI7vbC3", `
` "received-from": [ "IP4", "162.253.31.86" ], `
` "from-tag": "g61LnUx6Lm5ZwUAp", `
` "to-tag": "RCzLEby054b4GsK8OM5th2kArDosQ9N6", "command": "answer" `
`}`
`Feb 14 04:55:20 kammed-1-lv-103 rtpengine[27464]: WARNING:
[ct5Atc9TLOVPwKPDYBHPdwDz@y94Z4s9yJ1MvK7XDiiI7vbC3]: Unknown flag encountered:
'UDP/TLS/RTP/SAVP' `
I know that rtpengine itself can correctly handle UDP/TLS/RTP/SAVP and
UDP/TLS/RTP/SAVPF as long as kamailio rtpengine module passes them as transport
protocol and not flags.
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