使用XMPP Jingle进行信号传输，并在接收到session-initiate和transport-info之后，将其转换为SDP，但是当添加远程SDP时，会话描述为空。以下是转换后的SDP。 IETF - SDP，此转换有什么问题。
v=0
o=- 51214 1 IN IP4 13.232.101.208
s=-
t=0 0
a=group:BUNDLE audio
a=msid-semantic: WMS 512214
m=audio 64049 UDP/TLS/RTP/SAVPF 111 103 104 9 0 8 106 105 13 110 112
113 126
c=IN IP4 13.232.101.208
a=rtcp:64049 IN IP4 13.232.101.208
a=candidate:2815065402 1 udp 8331007 13.232.101.208 64049 typ relay raddr 203.99.50.227 rport 50046 generation 0
a=ice-ufrag:O1Vd
a=ice-pwd:0UTR9XQIpgGt4aBW2im7DLZH
a=fingerprint:sha-256C9:7D:2C:FF:32:36:AE:63:60:04:B8:D4:89:A9:72:D8:38:A5:FC:C9:3F:F2:DA:81:9F:32:9D:6F:8C:42:1B:23
a=setup:actpass
a=mid:audio
a=sendrecv
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=rtcp-fb:111 transport-cc
a=fmtp:111 minptime=10;useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
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:110 telephone-event/48000
a=rtpmap:112 telephone-event/32000
a=rtpmap:113 telephone-event/16000
a=rtpmap:126 telephone-event/8000
a=ssrc:2965848401 cname:Y1gr3KxtuJGewlt-1
a=ssrc:2965848401 msid:36d5d3c7-6a64-4fcb-ab4e-fa34c7737d7e-1 62654a8b-adca-4d1b-b293-0995f923edcd-1
a=ssrc:2965848401 mslabel:36d5d3c7-6a64-4fcb-ab4e-fa34c7737d7e-1
a=ssrc:2965848401 label:62654a8b-adca-4d1b-b293-0995f923edcd-1