【发布时间】：2019-12-24 18:39:59
【问题描述】：
我在将 WebRTC 调用从浏览器连接到 Android 原生应用时遇到问题。只是为了澄清一下，当我们从 Android 拨号到 Web 浏览器时，它可以正常工作并且通话已接通。
以下是从浏览器拨号时的SDK浏览器
v=0
o=mozilla...THIS_IS_SDPARTA-67.0.2 3998696948364254257 0 在 IP4 0.0.0.0
s=-
t=0 0
a=sendrecv
a=指纹：sha-256 DB:52:AF:5F:F1:55:DC:C6:AF:AA:2D:4F:83:BC:78:58:EE:DA:81:E2:BA:81:34:C1:B9: 14:5B:D8:B0:40:07:5D
a=group:BUNDLE 0 1
a=ice-options:trikle
a=msid-semantic:WMS *
m=音频 57545 UDP/TLS/RTP/SAVPF 109 9 0 8 101
c=IN IP4 176.9.75.12
a=candidate:0 1 UDP 2122252543 192.168.1.101 63270 典型主机
a=candidate:11 1 TCP 2105524479 192.168.1.101 9 类型主机 tcptype 活跃
a=candidate:0 2 UDP 2122252542 192.168.1.101 51377 类型主机
a=candidate:11 2 TCP 2105524478 192.168.1.101 9 类型主机 tcptype 活跃
a=candidate:1 1 UDP 1686052863 110.38.9.108 63270 typ srflx raddr 192.168.1.101 端口 63270
a=candidate:2 1 UDP 92217343 176.9.75.12 57545 典型中继 raddr 176.9.75.12 rport 57545
a=candidate:1 2 UDP 1686052862 110.38.9.108 51377 typ srflx raddr 192.168.1.101 端口 51377
a=candidate:2 2 UDP 92217342 5.9.205.188 59742 典型中继 raddr 5.9.205.188 rport 59742
a=sendrecv
a=候选人结束
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:2/recvonly urn:ietf:params:rtp-hdrext:csrc-audio-level
a=extmap:3 urn:ietf:params:rtp-hdrext:sdes:mid
a=fmtp:109 maxplaybackrate=48000;stereo=1;useinbandfec=1
a=fmtp:101 0-15
a=ice-pwd:ad76ac59889d2dbfc17c7197a5bf7fbc
a=ice-ufrag:4a27971e
a=mid:0
a=msid：{403cebe3-98f3-804c-8711-63078fdeecd1} {58497120-df50-c04f-929b-d0d3f2311ee6}
a=rtcp:59742 IN IP4 5.9.205.188
a=rtcp-mux
a=rtpmap:109 opus/48000/2
a=rtpmap:9 G722/8000/1
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 电话事件/8000
a=setup:actpass
a=ssrc:430883687 cname:{dc7d4aa2-5678-c745-ab1b-16660383829b}
m=视频 52189 UDP/TLS/RTP/SAVPF 120 121 126 97
c=IN IP4 176.9.75.12
a=candidate:0 1 UDP 2122252543 192.168.1.101 52775 类型主机
a=candidate:11 1 TCP 2105524479 192.168.1.101 9 类型主机 tcptype 活跃
a=candidate:0 2 UDP 2122252542 192.168.1.101 62134 类型主机
a=candidate:11 2 TCP 2105524478 192.168.1.101 9 类型主机 tcptype 活跃
a=candidate:1 1 UDP 1686052863 110.38.9.108 52775 typ srflx raddr 192.168.1.101 端口 52775
a=candidate:2 1 UDP 92217343 176.9.75.12 52189 典型中继 raddr 176.9.75.12 rport 52189
a=candidate:1 2 UDP 1686052862 110.38.9.108 62134 typ srflx raddr 192.168.1.101 rport 62134
a=candidate:2 2 UDP 92217342 5.9.205.188 60881 典型中继 raddr 5.9.205.188 rport 60881
a=sendrecv
a=候选人结束
a=extmap:3 urn:ietf:params:rtp-hdrext:sdes:mid
a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:5 urn:ietf:params:rtp-hdrext:toffset
a=fmtp:126 profile-level-id=42e01f;level-asymmetry-allowed=1;packetization-mode=1
a=fmtp:97 profile-level-id=42e01f;level-asymmetry-allowed=1
a=fmtp:120 max-fs=12288;max-fr=60
a=fmtp:121 max-fs=12288;max-fr=60
a=ice-pwd:ad76ac59889d2dbfc17c7197a5bf7fbc
a=ice-ufrag:4a27971e
a=mid:1
a=msid：{403cebe3-98f3-804c-8711-63078fdeecd1} {ec535e56-859b-0040-af22-dfc9a46de640}
a=rtcp:60881 IN IP4 5.9.205.188
a=rtcp-fb:120 nack
a=rtcp-fb:120 nack pli
a=rtcp-fb:120 ccm 杉木
a=rtcp-fb:120 goog-remb
a=rtcp-fb:121 nack
a=rtcp-fb:121 nack pli
a=rtcp-fb:121 ccm 杉木
a=rtcp-fb:121 goog-remb
a=rtcp-fb:126 nack
a=rtcp-fb:126 nack pli
a=rtcp-fb:126 ccm 杉木
a=rtcp-fb:126 goog-remb
a=rtcp-fb:97 nack
a=rtcp-fb:97 nack pli
a=rtcp-fb:97 ccm 杉木
a=rtcp-fb:97 goog-remb
a=rtcp-mux
a=rtpmap:120 VP8/90000
a=rtpmap:121 VP9/90000
a=rtpmap:126 H264/90000
a=rtpmap:97 H264/90000
a=setup:actpass
a=ssrc:2007361327 cname:{dc7d4aa2-5678-c745-ab1b-16660383829b}
接听电话时来自Android的SDP
v=0
o=- 7552000228569576067 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE 0 1
a=msid 语义：WMS ARDAMS
m=音频 9 UDP/TLS/RTP/SAVPF 109 9 0 8 101
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=candidate:0 1 UDP 2122252543 192.168.1.101 63270 典型主机
a=candidate:11 1 TCP 2105524479 192.168.1.101 9 类型主机 tcptype 活跃
a=candidate:0 2 UDP 2122252542 192.168.1.101 51377 类型主机
a=candidate:11 2 TCP 2105524478 192.168.1.101 9 类型主机 tcptype 活跃
a=candidate:1 1 UDP 1686052863 110.38.9.108 63270 typ srflx raddr 192.168.1.101 端口 63270
a=candidate:2 1 UDP 92217343 176.9.75.12 57545 典型中继 raddr 176.9.75.12 rport 57545
a=candidate:1 2 UDP 1686052862 110.38.9.108 51377 typ srflx raddr 192.168.1.101 端口 51377
a=candidate:2 2 UDP 92217342 5.9.205.188 59742 典型中继 raddr 5.9.205.188 rport 59742
a=ice-ufrag:Pmla
a=ice-pwd:CAEYOQZF7+JSa/YT4tDXWqFv
a=ice-options:trikle renomination
a=指纹：sha-256 58:DB:E8:47:30:8D:FD:04:3B:C0:6A:E1:68:6A:31:C2:C4:00:4A:51:74:6B:24:9C:13: E1:3F:BB:B0:AB:14:7B
a=setup:active
a=mid:0
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=sendrecv
a=rtcp-mux
a=rtpmap:109 opus/48000/2
a=fmtp:109 minptime=10;useinbandfec=1
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 电话事件/8000
a=ssrc:1539343785 cname:bTZH1y7Pwq/SmE4A
a=ssrc:1539343785 msid:ARDAMS ARDAMSa0
a=ssrc:1539343785 mslabel:ARDAMS
a=ssrc:1539343785 标签：ARDAMSa0
m=视频 9 UDP/TLS/RTP/SAVPF 126 120 121
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=candidate:0 1 UDP 2122252543 192.168.1.101 52775 类型主机
a=candidate:11 1 TCP 2105524479 192.168.1.101 9 类型主机 tcptype 活跃
a=candidate:0 2 UDP 2122252542 192.168.1.101 62134 类型主机
a=candidate:11 2 TCP 2105524478 192.168.1.101 9 类型主机 tcptype 活跃
a=candidate:1 1 UDP 1686052863 110.38.9.108 52775 typ srflx raddr 192.168.1.101 端口 52775
a=candidate:2 1 UDP 92217343 176.9.75.12 52189 典型中继 raddr 176.9.75.12 rport 52189
a=candidate:1 2 UDP 1686052862 110.38.9.108 62134 typ srflx raddr 192.168.1.101 rport 62134
a=candidate:2 2 UDP 92217342 5.9.205.188 60881 典型中继 raddr 5.9.205.188 rport 60881
a=ice-ufrag:Pmla
a=ice-pwd:CAEYOQZF7+JSa/YT4tDXWqFv
a=ice-options:trikle renomination
a=指纹：sha-256 58:DB:E8:47:30:8D:FD:04:3B:C0:6A:E1:68:6A:31:C2:C4:00:4A:51:74:6B:24:9C:13: E1:3F:BB:B0:AB:14:7B
a=setup:active
a=mid:1
a=extmap:5 urn:ietf:params:rtp-hdrext:toffset
a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=sendrecv
a=rtcp-mux
a=rtpmap:126 H264/90000
a=rtcp-fb:126 goog-remb
a=rtcp-fb:126 ccm 杉木
a=rtcp-fb:126 nack
a=rtcp-fb:126 nack pli
a=fmtp:126 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
a=rtpmap:120 VP8/90000
a=rtcp-fb:120 goog-remb
a=rtcp-fb:120 ccm 杉木
a=rtcp-fb:120 nack
a=rtcp-fb:120 nack pli
a=rtpmap:121 VP9/90000
a=rtcp-fb:121 goog-remb
a=rtcp-fb:121 ccm 杉木
a=rtcp-fb:121 nack
a=rtcp-fb:121 nack pli
a=ssrc:1992667211 cname:bTZH1y7Pwq/SmE4A
a=ssrc:1992667211 msid:ARDAMS ARDAMSv0
a=ssrc:1992667211 mslabel:ARDAMS
a=ssrc:1992667211 标签：ARDAMSv0
【问题讨论】：