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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