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SIP是怎样协商音频编码的?解决办法

热度:10883   发布时间:2013-02-26 00:00:00.0
SIP是怎样协商音频编码的?
大家好,
这是我用Wirelshark抓到的SIP邀请包和应答包:

No. Time Source Destination Protocol Info
  5 2011-11-25 11:31:46.009850 xxx.xxx.xxx.xxx 192.168.1.105 SIP/SDP Request: INVITE sip:90070048@xxx.xxx.xxx.xxx:25922;transport=UDP, with session description

Session Initiation Protocol
  Request-Line: INVITE sip:90070048@xxx.xxx.xxx.xxx:25922;transport=UDP SIP/2.0
  Message Header
  From: "7dmofedhjpev2h1ta9hdrj6gg8t"<sip:7dmofedhjpev2h1ta9hdxxx.xxx.xxx.xxx@192.168.8.20>;tag=5608328-1408a8c0-13c4-2831b8-628cd8c9-2831b8
  To: <sip:90070048@xxx.xxx.xxx.xxx:25922;transport=UDP>
  Call-ID: 56aedd8-1408a8c0-13c4-2831b8-1fdfb3b1-2831b8@192.168.8.20
  CSeq: 1 INVITE
  Via: SIP/2.0/UDP 192.168.8.20:5060;rport;branch=z9hG4bK-2831b8-9d023880-355ecae7
  Allow: INVITE,ACK,OPTIONS,REGISTER,INFO,REFER,SUBSCRIBE,NOTIFY,BYE
  User-Agent: DonJin SIP Server 2.2.0
  Max-Forwards: 70
  Contact: <sip:7dmofedhjpev2h1ta9hdxxx.xxx.xxx.xxx@xxx.xxx.xxx.xxx>
  Content-Type: application/SDP
  Content-Length: 300
   
Message Body
  Session Description Protocol
  Session Description Protocol Version (v): 0
  Owner/Creator, Session Id (o): DJXMS 0 0 IN IP4 192.168.8.20
  Session Name (s): DJXMS
  Connection Information (c): IN IP4 xxx.xxx.xxx.xxx
  Bandwidth Information (b): CT:1000
  Time Description, active time (t): 0 0
  Media Description, name and address (m): audio 10216 RTP/AVP 18 0 8 4 96 98 99
  Media Attribute (a): rtpmap:18 G729/8000
  Media Attribute (a): rtpmap:0 PCMU/8000
  Media Attribute (a): rtpmap:8 PCMA/8000
  Media Attribute (a): rtpmap:4 G723/8000
  Media Attribute (a): rtpmap:96 AMR/8000
  Media Attribute (a): rtpmap:98 telephone-event/8000
  Media Attribute (a): fmtp:98 0-15
  Media Attribute (a): rtpmap:99 tone/8000

No. Time Source Destination Protocol Info
  9 2011-11-25 11:31:46.108437 192.168.1.105 xxx.xxx.xxx.xxx SIP/SDP Status: 200 OK, with session description

Session Initiation Protocol
  Status-Line: SIP/2.0 200 OK
  Message Header
  Via: SIP/2.0/UDP 192.168.8.20:5060;rport=5060;branch=z9hG4bK-2831b8-9d023880-355ecae7;received=xxx.xxx.xxx.xxx
  From: "7dmofedhjpev2h1ta9hdrj6gg8t" <sip:7dmofedhjpev2h1ta9hdxxx.xxx.xxx.xxx@192.168.8.20>;tag=5608328-1408a8c0-13c4-2831b8-628cd8c9-2831b8
  To: <sip:90070048@xxx.xxx.xxx.xxx:25922;transport=UDP>;tag=2083651544
  Call-ID: 56aedd8-1408a8c0-13c4-2831b8-1fdfb3b1-2831b8@192.168.8.20
  CSeq: 1 INVITE
  Contact: <sip:90070048@192.168.1.105:25922>
  Content-Type: application/sdp
  User-Agent: CD.JUNCTION.ECC/V1.02 20101010 (linphone/1.0.0)
  Content-Length: 205
   
Message Body
  Session Description Protocol
  Session Description Protocol Version (v): 0
  Owner/Creator, Session Id (o): toto 123456 654321 IN IP4 192.168.1.105
  Session Name (s): A conversation
  Connection Information (c): IN IP4 192.168.1.105
  Time Description, active time (t): 0 0
  Media Description, name and address (m): audio 32013 RTP/AVP 0 8 98
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