T.3 MSMTSI audio offer/answer examples
26.1143GPPIP Multimedia Subsystem (IMS)Media handling and interactionMultimedia telephonyRelease 18TS
T.3.1 MSMTSI offer with multi-stream audio support
This offer includes multi-stream audio, sending simulcast with multiple codecs for the main audio, receiving two additional audio participants for local rendering, and receiving codec simulcast for all received audio streams. All video is omitted in this example, for brevity, but could be added according to any of the other examples in this annex.
Three different codecs are offered as audio simulcast in the send direction, separated by semicolons. In the simulcast receive direction, a single stream is offered, explicitly accepting three different alternative simulcast formats, separated by comma, which means that the used audio codec (RTP payload format) is allowed to change from one RTP packet to the next.
Blank lines are here added in the SDP for improved readability, but are not included in an actual SDP. SDP lines specifically interesting to this example are highlighted in bold, which would also not be the case in an actual SDP.
Table T.5: Example SDP offer from MSMTSI multi-stream audio
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SDP offer |
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m=audio 49152 RTP/AVP 98 97 99 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=rtpmap:98 EVS/16000/1 a=fmtp:98 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:97 AMR-WB/16000/1 a=fmtp:97 mode-change-capability=2; max-red=220 a=rtpmap:99 AMR/8000/1 a=fmtp:99 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:0 send pt=97 a=rid:1 send pt=98 a=rid:2 send pt=99 a=rid:3 recv pt=97 a=rid:4 recv pt=98 a=rid:5 recv pt=99 a=simulcast:send 0;1;2 recv 3,4,5 m=audio 49154 RTP/AVP 101 102 103 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:101 EVS/16000/1 a=fmtp:101 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:102 AMR-WB/16000/1 a=fmtp:102 mode-change-capability=2; max-red=220 a=rtpmap:103 AMR/8000/1 a=fmtp:103 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:6 recv pt=101 a=rid:7 recv pt=102 a=rid:8 recv pt=103 a=simulcast:recv 6,7,8 m=audio 49156 RTP/AVPF 104 105 106 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:104 EVS/16000/1 a=fmtp:104 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:105 AMR-WB/16000/1 a=fmtp:105 mode-change-capability=2; max-red=220 a=rtpmap:106 AMR/8000/1 a=fmtp:106 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:9 recv pt=104 a=rid:10 recv pt=105 a=rid:11 recv pt=106 a=simulcast:recv 9,10,11 |
T.3.2 MSMTSI answer with multi-stream audio support
This answer builds on the offer in annex T.3.1, includes multi-stream audio, accepting to receive simulcast with multiple codecs for the main audio, sending two additional audio participants for local rendering, and sending codec simulcast for all received audio streams. All video is omitted in this example, for brevity, but could be added according to any of the other examples in this annex.
The three different codecs from the offer are accepted as audio simulcast in the receive direction, separated by semicolons. In the simulcast send direction, a single stream is accepted, explicitly listing three different alternative simulcast formats, separated by comma, which means that the used audio codec (RTP payload format) may change from one RTP packet to the next.
As in annex T.2.2, it can be noted that the MSMTSI MRF needs to keep all payload type formats that it accepts to use for simulcast on the "m="-line in the answer.
Blank lines are here added in the SDP for improved readability, but not included in an actual SDP. SDP lines specifically interesting to this example are highlighted in bold, which would also not be the case in an actual SDP.
Table T.6: Example SDP answer from MSMTSI MRF accepting multi-stream audio
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SDP answer |
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m=audio 49152 RTP/AVPF 98 97 99 b=AS:113 a=acfg:1 t=1 a=rtpmap:98 EVS/16000/1 a=fmtp:98 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:97 AMR-WB/16000/1 a=fmtp:97 mode-change-capability=2; max-red=220 a=rtpmap:99 AMR/8000/1 a=fmtp:99 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:0 recv pt=97 a=rid:1 recv pt=98 a=rid:2 recv pt=99 a=rid:3 send pt=98 a=rid:4 send pt=97 a=rid:5 send pt=99 a=simulcast:recv 0;1;2 send 3,4,5 m=audio 49154 RTP/AVPF 101 102 103 b=AS:42 a=acfg:1 t=1 a=sendonly a=rtpmap:101 EVS/16000/1 a=fmtp:101 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:102 AMR-WB/16000/1 a=fmtp:102 mode-change-capability=2; max-red=220 a=rtpmap:103 AMR/8000/1 a=fmtp:103 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:6 send pt=101 a=rid:7 send pt=102 a=rid:8 send pt=103 a=simulcast:send 6,7,8 m=audio 49156 RTP/AVPF 104 105 106 b=AS:42 a=acfg:1 t=1 a=sendonly a=rtpmap:104 EVS/16000/1 a=fmtp:104 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:105 AMR-WB/16000/1 a=fmtp:105 mode-change-capability=2; max-red=220 a=rtpmap:106 AMR/8000/1 a=fmtp:106 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:9 send pt=104 a=rid:10 send pt=105 a=rid=11 send pt=106 a=simulcast:send 9,10,11 |
T.3.3 MSMTSI CCCEx SDP offer/answer example
Table T.7 shows example concurrent codec combinations supported at the terminal. All video is omitted in this example, for brevity, but could be added according to any of the other examples in this annex. As shown in Table T.7, the terminal may have identified three possible CCCEx combinations through profiles (shown for 6 participants). SDP offer examples from the terminal to the MRF for profile A is shown in Table T.8. The MSMTSI MRF may then send an SDP answer as shown using the simulcast attribute and multiple m-lines in Table T.9 enabling a multi-stream multiparty conference (among 6 participants).
Table T.7: Example concurrent codec capability configurations in MSMTSI terminals
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Number of participants |
CCCEx combinations supported at the MSMTSI terminals A, B and C |
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N = 6 |
A. [Encoder/send: AMR, AMR-WB, EVS] [Decoder/recv: 1 AMR, 1 AMR-WB, 3 EVS] B. [Encoder/send: AMR-WB, EVS] [Decoder/recv: 1 AMR-WB, 4 EVS] C. [Encoder/send: AMR, EVS] [Decoder/recv: 5 EVS] |
Table T.8: Example SDP offer for CCCEx example configuration from MSMTSI terminal A
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SDP offer |
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m=audio 49152 RTP/AVP 96 97 98 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=rtpmap:96 EVS/16000/1 a=fmtp:96 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:97 AMR-WB/16000/1 a=fmtp:97 mode-change-capability=2; max-red=220 a=rtpmap:98 AMR/8000/1 a=fmtp:98 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:0 send pt=96 a=rid:1 send pt=97 a=rid:2 send pt=98 a=rid:3 recv pt=96 a=rid:4 recv pt=97 a=rid:5 recv pt=98 a=simulcast:send 0;1;2 recv 3,4,5 m=audio 49154 RTP/AVP 101 102 103 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:101 EVS/16000/1 a=fmtp:101 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:102 AMR-WB/16000/1 a=fmtp:102 mode-change-capability=2; max-red=220 a=rtpmap:103 AMR/8000/1 a=fmtp:103 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:6 recv pt=101 a=rid:7 recv pt=102 a=rid:8 recv pt=103 a=simulcast:recv 6,7,8 m=audio 49156 RTP/AVP 104 105 106 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:104 EVS/16000/1 a=fmtp:104 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:105 AMR-WB/16000/1 a=fmtp:105 mode-change-capability=2; max-red=220 a=rtpmap:106 AMR/8000/1 a=fmtp:106 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:9 recv pt=104 a=rid:10 recv pt=105 a=rid:11 recv pt=106 a=simulcast:recv 9,10,11 m=audio 49158 RTP/AVP 107 108 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:107 AMR-WB/16000/1 a=fmtp:107 mode-change-capability=2; max-red=220 a=rtpmap:108 AMR/8000/1 a=fmtp:108 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:12 recv pt=107 a=rid:13 recv pt=108 a=simulcast:recv 12,13 m=audio 49160 RTP/AVP 109 b=AS:29 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:109 AMR/8000/1 a=fmtp:109 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:14 recv pt=109 a=simulcast:recv 14 |
Table T.9: Example SDP answer from MSMTSI MRF accepting multi-stream audio and enabling a conference with 6 participants (for SDP offer in Table T.8)
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SDP answer |
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m=audio 49152 RTP/AVPF 96 97 98 b=AS:113 a=acfg:1 t=1 a=rtpmap:96 EVS/16000/1 a=fmtp:96 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:97 AMR-WB/16000/1 a=fmtp:97 mode-change-capability=2; max-red=220 a=rtpmap:98 AMR/8000/1 a=fmtp:98 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:0 recv pt=96 a=rid:1 recv pt=97 a=rid:2 recv pt=98 a=rid:3 send pt=96 a=rid:4 send pt=97 a=rid:5 send pt=98 a=simulcast: recv 0;1;2 send 3,4,5 m=audio 49154 RTP/AVPF 101 102 103 b=AS:42 a=acfg:1 t=1 a=sendonly a=rtpmap:101 EVS/16000/1 a=fmtp:101 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:102 AMR-WB/16000/1 a=fmtp:102 mode-change-capability=2; max-red=220 a=rtpmap:103 AMR/8000/1 a=fmtp:103 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:6 send pt=101 a=rid:7 send pt=102 a=rid:8 send pt=103 a=simulcast:send 6,7,8 m=audio 49156 RTP/AVPF 105 106 b=AS:42 a=acfg:1 t=1 a=sendonly a=rtpmap:105 AMR-WB/16000/1 a=fmtp:105 mode-change-capability=2; max-red=220 a=rtpmap:106 AMR/8000/1 a=fmtp:106 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:10 send pt=105 a=rid:11 send pt=106 a=simulcast:send 10,11 m=audio 49158 RTP/AVPF 108 b=AS:29 a=acfg:1 t=1 a=sendonly a=rtpmap:108 AMR/8000/1 a=fmtp:108 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:13 send pt=108 a=simulcast:send 13 m=audio 49160 RTP/AVPF 109 b=AS:29 a=acfg:1 t=1 a=sendonly a=rtpmap:109 AMR/8000/1 a=fmtp:109 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:14 send pt=109 a=simulcast:send 14 |
Table T.10 shows an example, where the MSMTSI MRF identifies that there are only four participants in the conference and it therefore disables the two "m="lines.
Table T.10: Example SDP answer from MSMTSI MRF accepting multi-stream audio and enabling a conference with 4 participants (for SDP offer in Table T.8)
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SDP answer |
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m=audio 49152 RTP/AVPF 96 97 98 b=AS:113 a=acfg:1 t=1 a=rtpmap:96 EVS/16000/1 a=fmtp:96 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:97 AMR-WB/16000/1 a=fmtp:97 mode-change-capability=2; max-red=220 a=rtpmap:98 AMR/8000/1 a=fmtp:98 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:0 recv pt=96 a=rid:1 recv pt=97 a=rid:2 recv pt=98 a=rid:3 send pt=96 a=rid:4 send pt=97 a=rid:5 send pt=98 a=simulcast:recv 0;1;2 send 3,4,5 m=audio 49154 RTP/AVPF 101 102 103 b=AS:42 a=acfg:1 t=1 a=sendonly a=rtpmap:101 EVS/16000/1 a=fmtp:101 br=5.9-24.4; bw=nb-swb; max-red=220 a=rtpmap:102 AMR-WB/16000/1 a=fmtp:102 mode-change-capability=2; max-red=220 a=rtpmap:103 AMR/8000/1 a=fmtp:103 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:6 send pt=101 a=rid:7 send pt=102 a=rid:8 send pt=103 a=simulcast:send 6,7,8 m=audio 49156 RTP/AVPF 105 106 b=AS:42 a=acfg:1 t=1 a=sendonly a=rtpmap:105 AMR-WB/16000/1 a=fmtp:105 mode-change-capability=2; max-red=220 a=rtpmap:106 AMR/8000/1 a=fmtp:106 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:10 send pt=105 a=rid:11 send pt=106 a=simulcast:send 10,11 m=audio 0 RTP/AVP 108 m=audio 0 RTP/AVP 109 |
T.3.3a MSMTSI offer/answer examples using the compact CCC SDP attribute
Table T.3a1 shows an example SDP offer using the compact ccc_list SDP attribute to simultaneously describe the three media configurations listed for N=6 in Table T.7. Note that the media configuration for the codec is broader than all the concurrent codec configurations that can be supported by the offering MSMTSI terminal. Similar to table T.8, all video is omitted in this example for brevity, but could be added according to any of the other examples in this annex.
Table T.3a1: Example SDP offer from an MSMTSI terminal
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SDP offer |
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a = ccc_list:EVS;AMR-WB;AMR|ENC:1;1;1:DEC:3,1,1|ENC:1;1;0:DEC:4,1,0|ENC:1;0;1:DEC:5,0,0 m=audio 49152 RTP/AVP 96 97 98 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=rtpmap:96 EVS/16000/1 a=fmtp:96 br=13.2-24.4; bw=nb-swb; max-red=220 a=rtpmap:97 AMR-WB/16000/1 a=fmtp:97 mode-change-capability=2; max-red=220 a=rtpmap:98 AMR/8000/1 a=fmtp:98 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:0 send pt=96 a=rid:1 send pt=97 a=rid:2 send pt=98 a=rid:3 recv pt=96 a=rid:4 recv pt=97 a=rid:5 recv pt=98 a=simulcast:send 0;1;2 recv 3,4,5 m=audio 49154 RTP/AVP 101 102 103 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:101 EVS/16000/1 a=fmtp:101 br=13.2-24.4; bw=nb-swb; max-red=220 a=rtpmap:102 AMR-WB/16000/1 a=fmtp:102 mode-change-capability=2; max-red=220 a=rtpmap:103 AMR/8000/1 a=fmtp:103 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:6 recv pt=101 a=rid:7 recv pt=102 a=rid:8 recv pt=103 a=simulcast:recv 6,7,8 m=audio 49156 RTP/AVP 104 105 106 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:104 EVS/16000/1 a=fmtp:104 br=13.2-24.4; bw=nb-swb; max-red=220 a=rtpmap:105 AMR-WB/16000/1 a=fmtp:105 mode-change-capability=2; max-red=220 a=rtpmap:106 AMR/8000/1 a=fmtp:106 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:9 recv pt=104 a=rid:10 recv pt=105 a=rid:11 recv pt=106 a=simulcast:recv 9,10,11 m=audio 49158 RTP/AVP 107 108 109 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:107 EVS/16000/1 a=fmtp:107 br=13.2-24.4; bw=nb-swb; max-red=220 a=rtpmap:108 AMR-WB/16000/1 a=fmtp:108 mode-change-capability=2; max-red=220 a=rtpmap:109 AMR/8000/1 a=fmtp:109 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:12 recv pt=107 a=rid:13 recv pt=108 a=rid:14 recv pt=109 a=simulcast:recv 12,13,14 m=audio 49160 RTP/AVP 110,111,112 b=AS:42 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=recvonly a=rtpmap:110 EVS/16000/1 a=fmtp:110 br=13.2-24.4; bw=nb-swb; max-red=220 a=rtpmap:111 AMR-WB/16000/1 a=fmtp:111 mode-change-capability=2; max-red=220 a=rtpmap:112 AMR/8000/1 a=fmtp:112 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 a=rid:15 recv pt=110 a=rid:16 recv pt=111 a=rid:17 recv pt=112 a=simulcast:recv 15,16,17 |
An answering MSMTSI MRF that supports the ccc_list attribute may then send an SDP answer as shown Table T.x2, including the ccc_list attribute and using the simulcast attribute and multiple m-lines to enable a multi-stream multiparty conference among 6 participants. The included ccc_list attribute indicates the full capabilities of the MRF to concurrently switch multiple audio streams (10 EVS, 5 AMR-WB, 5 AMR-NB, etc…) towards the offering MSMTSI terminal eventhough the selected media configurations in the answer are only using a subset of the MRF’s capabilities.
Table T.3a2: Example SDP answer from the MSMTSI MRF accepting multi-stream audio and enabling a conference with 6 participants (for SDP offer in Table T.3a1)
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SDP answer |
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a = ccc_list:EVS;AMR-WB;AMR|ENC:10,5,5:DEC:1;1;1 m=audio 49152 RTP/AVPF 96 97 98 b=AS:113 a=acfg:1 t=1 a=rtpmap:96 EVS/16000/1 a=fmtp:96 br=13.2-24.4; bw=nb-swb; max-red=220 a=rtpmap:97 AMR-WB/16000/1 a=fmtp:97 mode-change-capability=2; max-red=220 a=rtpmap:98 AMR/8000/1 a=fmtp:98 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:0 recv pt=96 a=rid:1 recv pt=97 a=rid:2 recv pt=98 a=rid:3 send pt=96 a=rid:4 send pt=97 a=rid:5 send pt=98 a=simulcast: recv 0;1;2 send 3,4,5 m=audio 49154 RTP/AVPF 101 102 103 b=AS:42 a=acfg:1 t=1 a=sendonly a=rtpmap:101 EVS/16000/1 a=fmtp:101 br=13.2-24.4; bw=nb-swb; max-red=220 a=rtpmap:102 AMR-WB/16000/1 a=fmtp:102 mode-change-capability=2; max-red=220 a=rtpmap:103 AMR/8000/1 a=fmtp:103 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:6 send pt=101 a=rid:7 send pt=102 a=rid:8 send pt=103 a=simulcast:send 6,7,8 m=audio 49156 RTP/AVPF 105 106 b=AS:42 a=acfg:1 t=1 a=sendonly a=rtpmap:105 AMR-WB/16000/1 a=fmtp:105 mode-change-capability=2; max-red=220 a=rtpmap:106 AMR/8000/1 a=fmtp:106 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:10 send pt=105 a=rid:11 send pt=106 a=simulcast:send 10,11 m=audio 49158 RTP/AVPF 108 b=AS:29 a=acfg:1 t=1 a=sendonly a=rtpmap:108 AMR/8000/1 a=fmtp:108 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:13 send pt=108 a=simulcast:send 13 m=audio 49160 RTP/AVPF 109 b=AS:29 a=acfg:1 t=1 a=sendonly a=rtpmap:109 AMR/8000/1 a=fmtp:109 mode-change-capability=2; mode-set=0,2,4,7; max-red=220 a=ptime:20 a=maxptime:240 a=rid:14 send pt=109 a=simulcast:send 14 |
T.3.4 SIP OPTIONS request for multi-stream audio support
This offer includes multi-stream audio, sending simulcast with multiple codecs for the main audio, receiving two additional audio participants for local rendering, and receiving codec simulcast for all received audio streams. All video is omitted in this example, for brevity, but could be added according to any of the other examples in this annex.
Blank lines are here added in the SDP for improved readability, but are not included in an actual SDP. SDP lines specifically interesting to this example are highlighted in bold, which would also not be the case in an actual SDP.
Table T.11 shows an example SIP OPTIONS request from an MRF or a conference initiator. Table T.12 shows an example SIP OPTIONS response from a conference participant to the MRF or the initiator. The SIP OPTIONS response includes the SDP Offer of the conference participant. From Table T.12, the conference participant can allow for three concurrent encoding and three concurrent decoding of audio streams.
Table T.11: Example SIP OPTIONS request from an MRF or a conference initiator
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SIP OPTIONS request |
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OPTIONS sip:cccEx@mmcmh.com SIP/2.0 To: <sip:cccEx@mmcmh.com> From: P1 <sip:p1@msmtsi.com>;tag=TR26980 Call-ID: abcdefgh CSeq: 16384 OPTIONS Max-Forwards: 100 Via: SIP/2.0/UDP msmtsi.com; branch=z9hG4bKxxxxxx Contact: <sip:p1@msmtsi.com> Accept: application/cccex |
Table T.12: Example SIP OPTIONS response from a conference participant to the MRF or the initiator
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SIP OPTIONS response |
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SIP/2.0 200 OK Via: SIP/2.0/UDP msmtsi.com; branch= z9hG4bKxxxxxx; received=10.10.10.10 To: <sip:cccEx@mmcmh.com>;tag= TR26980E From: P1 <sip:p1@msmtsi.com>;tag=TR26980 Call-ID: abcdefgh CSeq: 16384 OPTIONS Allow: INVITE, ACK, CANCEL, OPTIONS, BYE Accept: application/cccex Content-Type: application/cccex a=ccc_list:EVS:AMR-WB:AMR|ENC:1;1;1:DEC:3,1,1 |
Annex U (informative):
IANA registration information for media types