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.

PR was merged.