when sems sbc (master branch) receives invite with this kind of sdp:
Message Body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): - 3084861429 1172237394 IN IP4
124.6.198.60
Session Name (s): -
Connection Information (c): IN IP4 124.6.198.60
Time Description, active time (t): 0 0
Session Attribute (a): tool:baresip 0.4.0
Media Description, name and address (m): audio 39674 RTP/AVP 96 97
98 99 9 8 0 101
Bandwidth Information (b): AS:125
Media Attribute (a): rtpmap:96 opus/48000
Media Attribute (a): rtpmap:97 CELT/32000
Media Attribute (a): rtpmap:98 speex/16000
Media Attribute (a): fmtp:98 mode="7";vbr=off;cng=on
Media Attribute (a): rtpmap:99 speex/8000
Media Attribute (a): fmtp:99 mode="7";vbr=off;cng=on
Media Attribute (a): rtpmap:9 G722/8000
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:101 telephone-event/8000
Media Attribute (a): fmtp:101 0-15
Media Attribute (a): sendrecv
Media Attribute (a): label:1
Media Attribute (a): ptime:20
Media Description, name and address (m): video 13966 RTP/AVP 96 34
97
Bandwidth Information (b): AS:875
Media Attribute (a): rtpmap:96 H264/90000
Media Attribute (a): fmtp:96
packetization-mode=0;profile-level-id=42800c
Media Attribute (a): rtpmap:34 H263/90000
Media Attribute (a): fmtp:34 F=1;CIF=1;CIF4=1
Media Attribute (a): rtpmap:97 MP4V-ES/90000
Media Attribute (a): fmtp:97 profile-level-id=3
Media Attribute (a): sendrecv
Media Attribute (a): label:2
Media Attribute (a): framerate:25
Media Attribute (a): rtcp-fb:* nack pli
Media Attribute (a): content:main
it replies in 200 ok with this kind of sdp:
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): sems 1 1 IN IP4 192.98.102.13
Session Name (s): sems
Connection Information (c): IN IP4 192.98.102.13
Time Description, active time (t): 0 0
Media Description, name and address (m): audio 40004 RTP/AVP 102 9
8 0 96
Media Attribute (a): rtpmap:102 speex/8000
Media Attribute (a): rtpmap:9 g722/8000
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:96 telephone-event/8000
Media Attribute (a): sendrecv
Media Description, name and address (m): video 0 RTP/AVP 96
Media Attribute (a): inactive
when sems then sends session timer re-invite, its sdp looks like this:
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): sems 1 1 IN IP4 192.98.102.13
Session Name (s): sems
Connection Information (c): IN IP4 192.98.102.13
Time Description, active time (t): 0 0
Media Description, name and address (m): audio 40004 RTP/AVP 102 9
8 0 96
Media Attribute (a): rtpmap:102 speex/8000
Media Attribute (a): rtpmap:9 g722/8000
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:96 telephone-event/8000
Media Attribute (a): sendrecv
Media Description, name and address (m): audio 40004 RTP/AVP 101
102 8 0 3 2 9 96 97 98 99 100
Media Attribute (a): rtpmap:101 iLBC/8000
Media Attribute (a): rtpmap:102 speex/8000
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:3 GSM/8000
Media Attribute (a): rtpmap:2 G721/8000
Media Attribute (a): rtpmap:9 g722/8000
Media Attribute (a): rtpmap:96 telephone-event/8000
Media Attribute (a): rtpmap:97 G726-32/8000
Media Attribute (a): rtpmap:98 G726-24/8000
Media Attribute (a): rtpmap:99 G726-40/8000
Media Attribute (a): rtpmap:100 G726-16/8000
Media Attribute (a): sendrecv
why does sems include two audio sections with overlapping codecs?
-- juha
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