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[技术讨论] SIP系统的组成 [复制链接]

Male不在线
Robin00

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注册：2017-12-8
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发表于 2021-7-9 12:18:21 |只看该作者 |倒序浏览
SIP系统的组成
SIP协议是会话发起协议，是一个应用层协议。
SIP建立和终止多媒体通信的5个方面：
——用户位置：确定用于通信的终端系统
——用户可用性：确定被呼叫者参加通信的意愿
——用户能力：确定使用的媒体和媒体参数
——会话建立：“响铃”方式建立会话
——会话管理：包括传输和终止会话、修改会话参数以及调用服务
SIP同时和其他协议一起使用形成多媒体架构：
——RTP：实时传输协议
——RTSP：实时传输流协议
——SDP：会话描述协议
SIP会话流程：
其中，在2个会话主体之间，间隔着两个SIP代理，代理服务器是用来代理多个SIP终端的服务器，进行客户端信令的重定向转发。
REGISTER
注册请求不建立对话，是对SIP代理服务器（或注册服务器）进行注册本地的URI地址绑定。
该请求的答复为200OK信令。
Request-Line: REGISTER sip:172.16.80.80 SIP/2.0
Method: REGISTER
Request-URI: sip:172.16.80.80
Request-URI Host Part: 172.16.80.80
[Resent Packet: False]
Message Header
From:<sip:25@172.16.178.25>;tag=11c587c0-0-13c4-525d6966-566380ee-525d6966
To: <sip:25@172.16.178.25>
Call-ID: 11c673a0-0-13c4-525d6966-3fa1b031-525d6966
CSeq: 1 REGISTER
Via: SIP/2.0/UDP172.16.178.25:5060;branch=z9hG4bK-525d6966-bce3b6f1-180cfdf
User-Agent: 7920 2010 3 26 0.1
Max-Forwards: 70
Contact: <sip:172.16.178.25>
Expires: 300
Content-Length: 0
200 OK（REGISTER）
Status-Line: SIP/2.0 200 OK
Status-Code: 200
[Resent Packet: False]
[Request Frame: 48]
[Response Time (ms): 26]
Message Header
From:<sip:25@172.16.178.25>;tag=11c587c0-0-13c4-525d6966-566380ee-525d6966
To: <sip:25@172.16.178.25>;tag=2360c00-0-13c4-62b9-52fe56a4-62b9
Call-ID: 11c673a0-0-13c4-525d6966-3fa1b031-525d6966
CSeq: 1 REGISTER
Contact:<sip:172.16.178.25:5060;transport=UDP>;expires=30
Via: SIP/2.0/UDP172.16.178.25:5060;branch=z9hG4bK-525d6966-bce3b6f1-180cfdf
Content-Length: 0
INVITE
Request-Line: INVITE sip:17826@172.16.178.3:5060 SIP/2.0
Method: INVITE
Request-URI: sip:17826@172.16.178.26:5060;transport=UDP
Request-URI User Part: 17826
Request-URI Host Part: 172.16.178.26
Request-URI Host Port: 5060
[Resent Packet: False]
Message Header
From:<sip:17824@172.16.178.24:5060>;tag=11c2d510-0-13c4-521dff22-6a332c0d-521dff22
To: <sip:17826@172.16.178.3:5060>
CSeq: 1 INVITE
Via: SIP/2.0/UDP172.16.178.24:5060;branch=z9hG4bK-521dff22-c52c9d49-700a1e12
Allow: INVITE,BYE,CANCEL,ACK,INFO,REGISTER,OPTIONS
User-Agent: 7920 2010 3 26 0.1
Max-Forwards: 70
Contact: <sip:17824@172.16.178.24:5060>
Content-Type: application/SDP
Content-Length: 792
Message Body
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): 7920 1377697570 1 IN IP4172.16.178.24
Session Information (i): 7920 2010 3 26 0.1
Connection Information (c): IN IP4 172.16.178.24
Bandwidth Information (b): AS:2048
Time Description, active time (t): 0 0
Media Description, name and address (m): audio 60040 RTP/AVP96 0 98 9 15 8 18 102 103 99
Media Attribute (a): rtpmap:96 mp3/8000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:98 G7221.C/8000
Media Attribute (a): rtpmap:9 g722-64k/8000
Media Attribute (a): rtpmap:15 G728/8000
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:18 G729/8000
Media Attribute (a): rtpmap:102 MP4A-LATM/8000
Media Attribute (a): rtpmap:103 MP4A-LATM/8000
Media Attribute (a): rtpmap:99 G719/8000
Media Attribute (a): fmtp:98 bitrate=24000
Media Attribute (a): fmtp:102 object=2
Media Attribute (a): fmtp:103 object=23
Media Attribute (a): rtcp:60049
Media Attribute (a): sendrecv
Media Description, name and address (m): video 60042 RTP/AVP106 97 34
Bandwidth Information (b): AS:2048
Media Attribute (a): rtpmap:106 H264/90000
Media Attribute (a): rtpmap:97 MPEG4/90000
Media Attribute (a): rtpmap:34 H263/90000
Media Attribute (a): fmtp:106 profile-level-id=40804e;max-mbps=243000; max-fs=8192;
Media Attribute (a): fmtp:97AUTO=1;CIF16=1;CIF4=1;CIF2=1;CIF=1;
Media Attribute (a): fmtp:0 CIF=1;
Media Attribute (a): rtcp:60051
Media Attribute (a): sendrecv
100 Trying
Status-Line: SIP/2.0 100 Trying
Status-Code: 100
[Resent Packet: False]
[Request Frame: 927]
[Response Time (ms): 34]
Message Header
From: <sip:17824@172.16.178.24:5060;transport=UDP>;tag=11c2d510-0-13c4-521dff22-6a332c0d-521dff22
To: <sip:17826@172.16.178.26:5060>
Call-ID:11c31dd8-0-13c4-521dff22-7ac7134-521dff22@172.16.178.24
CSeq: 2 INVITE
Via: SIP/2.0/UDP 172.16.178.24:5060;branch=z9hG4bK-521dff22-c52c9db3-67c76d03
Contact: <sip:17826@172.16.178.26:5060;transport=UDP>
Content-Length: 0
180 Ringing
Status-Line: SIP/2.0 180 Ringing
Status-Code: 180
[Resent Packet: False]
[Request Frame: 927]
[Response Time (ms): 34]
Message Header
From:<sip:17824@172.16.178.24:5060;transport=UDP>;tag=11c2d510-0-13c4-521dff22-6a332c0d-521dff22
To:<sip:17826@172.16.178.26:5060>;tag=3143fe8-0-13c4-521dff2a-6f440c17-521dff2a
CSeq: 2 INVITE
Via: SIP/2.0/UDP172.16.178.24:5060;branch=z9hG4bK-521dff22-c52c9db3-67c76d03
Contact: <sip:17826@172.16.178.26:5060;transport=UDP>
Content-Length: 0
200 OK
Status-Line: SIP/2.0 200 OK
Status-Code: 200
[Resent Packet: False]
[Request Frame: 927]
[Response Time (ms): 55]
Message Header
From:<sip:17824@172.16.178.24:5060;transport=UDP>;tag=11c2d510-0-13c4-521dff22-6a332c0d-521dff22
To:<sip:17826@172.16.178.26:5060>;tag=3143fe8-0-13c4-521dff2a-6f440c17-521dff2a
Call-ID:11c31dd8-0-13c4-521dff22-7ac7134-521dff22@172.16.178.24
CSeq: 2 INVITE
Allow: INVITE,BYE,CANCEL,ACK,INFO,REGISTER,OPTIONS,UPDATE
Supported: 100rel
User-Agent:  UNKNOWN  
Level: Level_County
ScreenNum: 0
Via: SIP/2.0/UDP 172.16.178.24:5060;branch=z9hG4bK-521dff22-c52c9db3-67c76d03
Contact: <sip:17826@172.16.178.26:5060;transport=UDP>
Content-Type: application/SDP
Content-Length: 798
Message Body
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): 7920B 1377697570 1 IN IP4172.16.178.26
Session Information (i): 7920B V1.4
Connection Information (c): IN IP4 172.16.178.26
Bandwidth Information (b): AS:12590
Time Description, active time (t): 0 0
Media Description, name and address (m): audio 60040 RTP/AVP8 0 98 9 15 96 18 99
Connection Information (c): IN IP4 172.16.178.26
Media Attribute (a): fmtp:98 bitrate=24000
Media Attribute (a): rtcp:60049
Media Attribute (a): tpattrib:capsign:0 capscreen:-1
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:98 G7221.C/8000
Media Attribute (a): rtpmap:9 g722-64k/8000
Media Attribute (a): rtpmap:15 G728/8000
Media Attribute (a): rtpmap:96 mp3/8000
Media Attribute (a): rtpmap:18 G729/8000
Media Attribute (a): rtpmap:99 G719/8000
Media Attribute (a): sendrecv
Media Description, name and address (m): video 60042 RTP/AVP106 97 34
Connection Information (c): IN IP4 172.16.178.26
Bandwidth Information (b): AS:8192
Media Attribute (a): fmtp:106 profile-level-id=42801f;max-mbps=216000; max-fs=3840;
Media Attribute (a): fmtp:97AUTO=1;CIF16=1;CIF4=1;CIF2=1;CIF=1;
Media Attribute (a): fmtp:34 CIF=1;
Media Attribute (a): rtcp:60051
Media Attribute (a): tpattrib:capsign:0 capscreen:-1
Media Attribute (a): rtpmap:106 H264/90000
Media Attribute (a): rtpmap:97 MPEG4/90000
Media Attribute (a): rtpmap:34 H263/90000
Media Attribute (a): sendrecv
ACK
Request-Line: ACK sip:17826@172.16.178.26:5060;transport=UDPSIP/2.0
Method: ACK
Request-URI: sip:17826@172.16.178.26:5060;transport=UDP
[Resent Packet: False]
[Request Frame: 927]
[Response Time (ms): 159]
Message Header
From: <sip:17824@172.16.178.24:5060;transport=UDP>;tag=11c2d510-0-13c4-521dff22-6a332c0d-521dff22
To:<sip:17826@172.16.178.26:5060;transport=UDP>;tag=3143fe8-0-13c4-521dff2a-6f440c17-521dff2a
Call-ID:11c31dd8-0-13c4-521dff22-7ac7134-521dff22@172.16.178.24
CSeq: 2 ACK
Via: SIP/2.0/UDP172.16.178.24:5060;branch=z9hG4bK-521dff22-c52c9e56-4838bad0
Max-Forwards: 70
Contact: <sip:17824@172.16.178.24:5060;transport=UDP>
Content-Length: 0
INFO
Request-Line: INFOsip:17824@172.16.178.24:5060;transport=UDP SIP/2.0
Method: INFO
Request-URI: sip:17824@172.16.178.24:5060;transport=UDP
[Resent Packet: False]
Message Header
From: <sip:17826@172.16.178.26:5060>;tag=3143fe8-0-13c4-521dff2a-6f440c17-521dff2a
To:<sip:17824@172.16.178.24:5060;transport=UDP>;tag=11c2d510-0-13c4-521dff22-6a332c0d-521dff22
Call-ID:11c31dd8-0-13c4-521dff22-7ac7134-521dff22@172.16.178.24
CSeq: 1 INFO
Via: SIP/2.0/UDP172.16.178.26:5060;branch=z9hG4bK-521dff2a-c52cbeae-5f3840e7
Max-Forwards: 70
Contact: <sip:17826@172.16.178.26:5060;transport=UDP>
Content-Type: application/media_control+xml
Content-Length: 198
Message Body
eXtensible Markup Language
200 OK（INFO）
Status-Line: SIP/2.0 200 OK
Status-Code: 200
[Resent Packet: False]
Message Header
From: <sip:17826@172.16.178.26:5060;transport=UDP>;tag=3143fe8-0-13c4-521dff2a-6f440c17-521dff2a
To:<sip:17824@172.16.178.24:5060;transport=UDP>;tag=11c2d510-0-13c4-521dff22-6a332c0d-521dff22
Call-ID:11c31dd8-0-13c4-521dff22-7ac7134-521dff22@172.16.178.24
CSeq: 1 INFO
Via: SIP/2.0/UDP172.16.178.26:5060;branch=z9hG4bK-521dff2a-c52cbeae-5f3840e7
Contact: <sip:17824@172.16.178.24:5060;transport=UDP>
Content-Length: 0
————————————————
版权声明：本文为CSDN博主「红坦坦」的原创文章，遵循CC4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/davidsguo008/article/details/73353837

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