Webrtc SDP音频在发送方不起作用，但是接收方可以收听发送方语音。 双方的视频效果都很好
回答SDP：-
v = 0 \ r \ no = mozilla ... THIS_IS_SDPARTA-61.0 6227063584330165543 0 IN IP4 0.0.0.0 \ r \ ns =-\ r \ nt = 0 0 \ r \ na = sendrecv \ r \ na = fingerprint ：sha-256 5B：EE：F9：8B：A4：77：24：AF：C8：1F：7A：12：75：1C：4B：6F：33：45：D9：3B：BB：05：F5： 18：03：32：9D：2D：AB：BC：FC：01 \ r \ na = group：捆绑sdparta_0 sdparta_1 \ r \ na = ice-options：trickle \ r \ na = msid-semantic：WMS * \ r \ nm =音频9 UDP / TLS / RTP / SAVPF 109101 \ r \ nc = IN IP4 0.0.0.0 \ r \ na = sendrecv \ r \ na = extmap：1 urn：ietf：params：rtp-hdrext：ssrc-音频级别\ r \ na = extmap：3 urn：ietf：params：rtp-hdrext：sdes：mid \ r \ na = fmtp：109 maxplaybackrate = 48000; stereo = 1; useinbandfec = 1 \ r \ na = fmtp： 101 0-15 \ r \ na = ice-pwd：4c2cb9a31321054e816200974f041439 \ r \ na = ice-ufrag：408ddefb \ r \ na = mid：sdparta_0 \ r \ na = msid：{d83c16a6-8c6b-48a6-9df5-a0e26ca801f7} {f1388817-3547-4e77-aca1-da974eaa0dd3} \ r \ na = rtcp-mux \ r \ na = rtpmap：109 opus / 48000/2 \ r \ na = rtpmap：101电话事件/ 8000 \ r \ na =设置：active \ r \ na = ssrc：711252568 cname：{83856f3b-3e35-4fff-8bd1-5c3a0a0b0cce} \ r \ nm = video 9 UDP / TLS / RTP / SAVPF 120 \ r \ nc = IN IP4 0.0.0.0 \ r \ na = sendrecv \ r \ na = extmap： 3 urn：ietf：params：rtp-hdrext：sdes：mid \ r \ na = extmap：4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time \ r \ na = extmap：5 urn：ietf：params：rtp-hdrext：toffset \ r \ na = fmtp：120 max-fs = 12288; max-fr = 60 \ r \ na = ice-pwd：4c2cb9a31321054e816200974f041439 \ r \ na = ice-ufrag：408ddefb \ r \ na = mid：sdparta_1 \ r \ na = msid： {d83c16a6-8c6b-48a6-9df5-a0e26ca801f7} {37ab4190-689d-4607-b031-5855790d6c10} \ r \ na = rtcp-fb：120 nack \ r \ na = rtcp-fb：120 nack pli \ r \ na = rtcp-fb：120 ccm fir \ r \ na = rtcp-fb：120 goog-remb \ r \ na = rtcp-mux \ r \ na = rtpmap：120 VP8 / 90000 \ r \ na = setup：active \ r \ na = ssrc：984964499 cname：{83856f3b-3e35-4fff-8bd1-5c3a0a0b0cce} \ r \ n