A.9a SDP offer/answer regarding the use of Reduced-Size RTCP
26.1143GPPIP Multimedia Subsystem (IMS)Media handling and interactionMultimedia telephonyRelease 18TS
This example shows the offers and answers for a session between two MTSI clients controlling the use of Reduced-Size RTCP.
Table A.9a.1: SDP example for Reduced-Size RTCP
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SDP offer |
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m=audio 49152 RTP/AVP 97 98 a=tcap:1 RTP/AVPF a=pcfg:1 t=1 a=rtcp-fb:* trr-int 5000 a=rtcp-rsize a=rtpmap:97 AMR/8000/1 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; octet-align=1 a=ptime:20 a=maxptime:240 |
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SDP answer |
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m=audio 49152 RTP/AVPF 97 a=acfg:1 t=1 a=rtcp-fb:* trr-int 5000 a=rtcp-rsize a=rtpmap:97 AMR/8000/1 a=fmtp:97 mode-change-capability=2; max-red=220 a=ptime:20 a=maxptime:240 |
Comments:
This example allows the use of Reduced-Size RTCP (attribute rtcp-rsize) for the adaptation feedback. Moreover the minimum interval between two regular compound RTCP packets is set to 5000 milliseconds.