Anatomy of a WebRTC SDP (original)

You found our old version of the interactive SDP guide. Check out the new and updated version here: https://webrtchacks.com/sdp-anatomy/

See the source post by Antón Román for more details: https://webrtchacks.com/anatomy-webrtc-sdp/

Global Lines v=0 o=- 680121471469462884 2 IN IP4 127.0.0.1 s=- t=0 0 a=group:BUNDLE audio video a=msid-semantic: WMS GUKF430Khp9jEQiPrdYe0LbTAALiNAKAIfl2 Audio Lines m=audio 54278 RTP/SAVPF 111 103 104 0 8 106 105 13 126 c=IN IP4 180.6.6.6 a=rtcp:54278 IN IP4 180.6.6.6 ICE Candidates a=candidate:4022866446 1 udp 2113937151 192.168.0.197 36768 typ host generation 0 a=candidate:4022866446 2 udp 2113937151 192.168.0.197 36768 typ host generation 0 a=candidate:2706108158 1 tcp 1509957375 192.168.0.197 0 typ host generation 0 a=candidate:2706108158 2 tcp 1509957375 192.168.0.197 0 typ host generation 0 a=candidate:1853887674 1 udp 1845501695 46.2.2.2 36768 typ srflx raddr 192.168.0.197 rport 36768 generation 0 a=candidate:1853887674 2 udp 1845501695 46.2.2.2 36768 typ srflx raddr 192.168.0.197 rport 36768 generation 0 a=candidate:2157334355 1 udp 33562367 180.6.6.6 54278 typ relay raddr 46.2.2.2 rport 38135 generation 0 a=candidate:2157334355 2 udp 33562367 180.6.6.6 54278 typ relay raddr 46.2.2.2 rport 38135 generation 0 ICE Parameters a=ice-ufrag:kwlYyWNjhC9JBe/V a=ice-pwd:AU/SQPupllyS0SDG/eRWDCfA a=ice-options:google-ice DTLS Parameters a=fingerprint:sha-256 D1:2C:BE:AD:C4:F6:64:5C:25:16:11:9C:AF:E7:0F:73:79:36:4E:9C:1E:15:54:39:0C:06:8B:ED:96:86:00:39 a=setup:actpass a=mid:audio a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level a=sendrecv a=rtcp-mux a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:qwaJWnQkwMChhIQ/dkC9tUnijwUBe2k50XLxm0G3 Codec Parameters a=rtpmap:111 opus/48000/2 a=fmtp:111 minptime=10 a=rtpmap:103 ISAC/16000 a=rtpmap:104 ISAC/32000 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:106 CN/32000 a=rtpmap:105 CN/16000 a=rtpmap:13 CN/8000 a=rtpmap:126 telephone-event/8000 a=maxptime:60 SSRC Parameters a=ssrc:189858836 cname:rfQMs6/rvuHHWkM4 a=ssrc:189858836 msid:GUKF430Khp9jEQiPrdYe0LbTAALiNAKAIfl2 ea392930-e126-4573-bea3-bfba519b4d59 a=ssrc:189858836 mslabel:GUKF430Khp9jEQiPrdYe0LbTAALiNAKAIfl2 a=ssrc:189858836 label:ea392930-e126-4573-bea3-bfba519b4d59 Video Lines m=video 54278 RTP/SAVPF 100 116 117 c=IN IP4 180.6.6.6 a=rtcp:54278 IN IP4 180.6.6.6 ICE Candidates a=candidate:4022866446 1 udp 2113937151 192.168.0.197 36768 typ host generation 0 a=candidate:4022866446 2 udp 2113937151 192.168.0.197 36768 typ host generation 0 a=candidate:2706108158 1 tcp 1509957375 192.168.0.197 0 typ host generation 0 a=candidate:2706108158 2 tcp 1509957375 192.168.0.197 0 typ host generation 0 a=candidate:1853887674 1 udp 1845501695 46.2.2.2 36768 typ srflx raddr 192.168.0.197 rport 36768 generation 0 a=candidate:1853887674 2 udp 1845501695 46.2.2.2 36768 typ srflx raddr 192.168.0.197 rport 36768 generation 0 a=candidate:2157334355 1 udp 33562367 180.6.6.6 54278 typ relay raddr 46.2.2.2 rport 38135 generation 0 a=candidate:2157334355 2 udp 33562367 180.6.6.6 54278 typ relay raddr 46.2.2.2 rport 38135 generation 0 ICE Parameters a=ice-ufrag:kwlYyWNjhC9JBe/V a=ice-pwd:AU/SQPupllyS0SDG/eRWDCfA a=ice-options:google-ice DTLS Parameters a=fingerprint:sha-256 D1:2C:BE:AD:C4:F6:64:5C:25:16:11:9C:AF:E7:0F:73:79:36:4E:9C:1E:15:54:39:0C:06:8B:ED:96:86:00:39 a=setup:actpass a=mid:video a=extmap:2 urn:ietf:params:rtp-hdrext:toffset a=extmap:3http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time a=sendrecv a=rtcp-mux a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:qwaJWnQkwMChhIQ/dkC9tUnijwUBe2k50XLxm0G3 Codec Parameters a=rtpmap:100 VP8/90000 a=rtcp-fb:100 ccm fir a=rtcp-fb:100 nack a=rtcp-fb:100 goog-remb a=rtpmap:116 red/90000 a=rtpmap:117 ulpfec/90000 SSRC Parameters a=ssrc:1993357196 cname:rfQMs6/rvuHHWkM4 a=ssrc:1993357196 msid:GUKF430Khp9jEQiPrdYe0LbTAALiNAKAIfl2 753ad6b1-31a6-4fea-8070-269c6df6ff0e a=ssrc:1993357196 mslabel:GUKF430Khp9jEQiPrdYe0LbTAALiNAKAIfl2 a=ssrc:1993357196 label:753ad6b1-31a6-4fea-8070-269c6df6ff0e