Gonzalo Camarillo Advanced Signalling Research Lab 48th IETF MMUSIC WG Gonzalo Camarillo draft-camarillo-sip-sdp-00.txt.

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Presentation transcript:

Gonzalo Camarillo Advanced Signalling Research Lab 48th IETF MMUSIC WG Gonzalo Camarillo draft-camarillo-sip-sdp-00.txt SDP media alignment in SIP

Gonzalo Camarillo Advanced Signalling Research Lab 48th IETF MMUSIC WG Outline What is needed? Scenarios Cellular access 3rd party developed RTP libraries Transcoding point Proposal: Flow identification

Gonzalo Camarillo Advanced Signalling Research Lab 48th IETF MMUSIC WG What is needed? Systems have to be able to receive media from a single media stream, encoded in different formats during the session, in different ports and host interfaces. Better method to perform SDP media alignment in SIP than matching the nth lines.

Gonzalo Camarillo Advanced Signalling Research Lab 48th IETF MMUSIC WG Packet filter (TFT) Cellular Access INVITE contains different port numbers for different codecs RAB 1 RAB 2 RAB 3

Gonzalo Camarillo Advanced Signalling Research Lab 48th IETF MMUSIC WG 3rd party developed RTP libraries INVITE contains different port numbers for different codecs SIP User Agent RTP library supporting PCM and GSM RTP library supporting AMR UDP 20000UDP Interface

Gonzalo Camarillo Advanced Signalling Research Lab 48th IETF MMUSIC WG Transcoding point Cellular Wired infrastructure Transcoding point INVITE contains different IP addresses for different codecs

Gonzalo Camarillo Advanced Signalling Research Lab 48th IETF MMUSIC WG Proposal SDP session parameter: Flow Identifier (fid) Example: v=0 o=Laura IN IP4 second.example.com t=0 0 c=IN IP m=audio RTP/AVP 0 a=fid:1 m=audio RTP/AVP 8 c=IN IP a=fid:1 m=audio RTP/AVP 0 a=fid:2 m=audio RTP/AVP 8 c=IN IP a=fid:2