EPON技术及应用课件：VOIP-SIP.ppt

内容简介SIP协议概述SIP消息结构和类型SIP基本消息流程SIP消息实例分析SIP建立通讯的过程用SIP来建立通讯通常需要有六个步骤:登记,发起和定位用户.进行媒体协商--通常采用SDP方式来携带媒体参数.由被叫方来决定是否接纳该呼叫.呼叫媒体流建立并交互.呼叫更改或处理如呼叫转移.呼叫终止.Registration-登记每当用户打开SIP终端时(如PC,IPPHONE),将向代理服务器/登记服务器发起登记过程登记过程需要周期刷新登记服务器将把SIP终端所登记的信息传送到位置服务器存放.SIPMessages:REGISTER–RegisterstheaddresslistedintheToheaderfield.200–OK.ProxyServerSIPPhoneUserLocation/RegistrationServerREGISTERREGISTER200200注册注销流程SIP基本流程INVITE(发起呼叫)100(收到了，正在接续)180(振铃/回铃音)200(摘机)ACK(知道摘机了)媒体流BYE(挂机)200(知道挂机了)主叫摘机拨号被叫振铃主叫回铃音被叫摘机通话通话被叫挂机主叫忙音ZXECSIBX1000ZXECSIBX1000SIP呼叫建立和释放－消息交互网元RTPMEDIAPATHBYE200(OK)呼叫拆除媒体通道呼叫建立ProxyServer1ProxyServer2UserAgentBUserAgentA100(Trying)525INVITE12INVITE3INVITE5100(Trying)4ACK15200(OK)10200(OK)12200(OK)11180(Ringing)8180(Ringing)92318180(Ringing)76100(Trying)OPTIONS16200(OK)17事务1事务2事务3会话ACK13ACK14BYE19BYE20200(OK)21200(OK)22内容简介SIP协议概述SIP消息结构和类型SIP基本消息流程SIP消息实例分析SIP协议应用实例CorePacketNetworkZXSS10SS1BIP:Soft-phoneIP:36(TIANJUN)SIPport:5060Number:#0*109316I704IP:370755PSTNSwitchsipH.248序号:12INVITEsip:0755526778086@SIP/2.0Via:SIP/2.0/UDP36:5060;branch=z9hG4bK3af571e7266aTo:0755526778086sip:0755526778086@From:#0*109316sip:#0*109316@;tag=884a420a-7062206315162668Call-ID:072a13acfdc2669-884a420a@36CSeq:23944INVITEContact:sip:#0*109316@36:5060Max-Forwards:70User-Agent:ZTEMULTIMEDIASIPPHONE/V1.004-01-10Content-Type:application/sdpContent-Length:288v=0o=#0*10931635077611793608424475INIP436s=sessionSDPc=INIP436t=00m=audio10000RTP/AVP04818a=ptime:20a=rtpmap:0PCMU/8000a=rtpmap:4G723/8000a=rtpmap:8PCMA/8000a=rtpmap:18G729/8000m=video10002RTP/AVP34a=rtpmap:34H263/90000INVITESIP协议跟