📄 001_46.htm

📁 通讯类的标准。对要开发SS7的朋友有很大帮助的。（通讯协议）
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<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=3 src="001_46.files/46_46_1.jpg" width=558 
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<DIV class=im4><IMG height=413 src="001_46.files/46_46_5.jpg" width=474 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>（续）</SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN class=ft1>SIP 
&nbsp;&nbsp;<SPAN class=em4>方&nbsp;法</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft1>BYE</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR>客户端发送这条消息给呼叫代理以释放呼叫。发送端点终止介质流，认为呼叫已经终止，而</NOBR></SPAN> <SPAN 
class=ps4><NOBR>不管来自远程端点的应答。不需要其他方返回<SPAN class=em0>BYE</SPAN></NOBR></SPAN> 
<SPAN class=ps5><NOBR><SPAN class=ft1>CANCEL</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR>这个方法取消正在进行中的请求，但是当没有正在进行中的请求时，它对于已经建立的呼叫</NOBR></SPAN> <SPAN 
class=ps7><NOBR>没有作用。<SPAN class=em0>CACEL</SPAN>方法必须通过<SPAN 
class=em0>SIP</SPAN>报头中的呼叫<SPAN class=em0>ID</SPAN>、呼叫顺序编号（<SPAN 
class=em0>Cseq</SPAN>）、<SPAN class=em0>To</SPAN>和<SPAN 
class=em0>From</SPAN>等值</NOBR></SPAN> <SPAN class=ps8><NOBR>明确标识呼叫</NOBR></SPAN> 
<SPAN class=ps9><NOBR><SPAN class=ft1>REGISTER</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR>客户端用<SPAN class=em0>REGISTER</SPAN>方法向一个<SPAN 
class=em0>SIP</SPAN>服务器注册<SPAN class=em0>To</SPAN>报头域中列出的地址。通过发送<SPAN 
class=em0>REGISTER</SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR>请求到公认的“所有<SPAN 
class=em0>SIP</SPAN>服务器”组播地址“<SPAN class=em0>sip.mcast.net</SPAN>”（<SPAN 
class=em0>224.0.1.75</SPAN>），用户代理可以在启</NOBR></SPAN> <SPAN 
class=ps12><NOBR>动时向本地服务器注册。注册可以由用户完成，也可以由第三方为他完成。这会在<SPAN 
class=em0>From</SPAN>域中显</NOBR></SPAN> <SPAN class=ps13><NOBR>示出来</NOBR></SPAN> 
<SPAN class=ps14><NOBR><SPAN class=ft3>在详细讨论<SPAN 
class=em1>SIP</SPAN>消息报头和应答消息之前，首先看一下协议所支持的基本呼叫模型。希望</SPAN></NOBR></SPAN> <SPAN 
class=ps15><NOBR><SPAN class=ft3>这种方法能够使报头说明和应答编码细节易于理解。</SPAN></NOBR></SPAN> 
<SPAN class=ps16><NOBR><SPAN class=ft4>3. SIP<SPAN 
class=em5>呼叫模型</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN 
class=ft3>我们来看一下参考图中的呼叫，它是从<SPAN class=em1>penny@dflx.com</SPAN>到<SPAN 
class=em1>lucy@remotesysname.com</SPAN>。图</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR><SPAN class=ft5>1 - 2 7<SPAN 
class=em2>是最基本的呼叫模型的呼叫流。在第一个例子中，用户代理直接工作，从发送方</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft3>（<SPAN 
class=em1>penny@dflx.com</SPAN>）发送一条<SPAN class=em1>INVITE</SPAN>命令到被叫方（<SPAN 
class=em1>lucy@remotesysname.com</SPAN>）。这意味着</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR><SPAN class=ft4>penny@dflx.com<SPAN class=em2>（</SPAN><SPAN 
class=em2>端点</SPAN>A<SPAN class=em2>）</SPAN><SPAN 
class=em2>的用户代理已经通过一次</SPAN>DNS<SPAN 
class=em2>查询，把</SPAN>lucy@remotesysname.com</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR><SPAN class=ft3>（端点<SPAN class=em1>B<SPAN 
class=em2>）</SPAN></SPAN>的名称转化为<SPAN 
class=em1>IP</SPAN>地址，以在它自己的域内使用。</SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft0>图<SPAN class=em6>1-27 
&nbsp;&nbsp;SIP</SPAN>基本呼叫模型—代理之间的直接信令</SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR><SPAN class=ft6>46&nbsp;&nbsp;<SPAN class=em3>IP </SPAN><SPAN 
class=em7>电话技术：稳定的</SPAN><SPAN class=em3>VoIP</SPAN><SPAN 
class=em7>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR><SPAN 
class=ft7>文档</SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN class=ft8>与<SPAN 
class=em0>CONNECT</SPAN>类似</SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN 
class=ft8>（最后，编码200）</SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft8>（最后，编码200）</SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR><SPAN 
class=ft8>不需要<SPAN class=em0>200 OK</SPAN>应答</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft8>终止呼叫</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR><SPAN class=ft8>同样，在另一个方向</SPAN></NOBR></SPAN> <SPAN 
class=ps31><NOBR><SPAN class=ft8>成功-这个方向的呼叫也已终止</SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR><SPAN class=ft8>信令由<SPAN class=em0>UDP</SPAN>或<SPAN 
class=em0>TCP</SPAN>完成</SPAN></NOBR></SPAN> <SPAN class=ps33><NOBR><SPAN 
class=ft8>成功-这个方向的呼叫终止</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN 
class=ft8>端点<SPAN class=em0>A</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR><SPAN class=ft8>端点<SPAN class=em0>B</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps36><NOBR><SPAN class=ft9>trying<SPAN class=em4>（</SPAN><SPAN 
class=em4>进程报告，编码</SPAN>100<SPAN class=em4>）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps37><NOBR><SPAN class=ft9>ACK<SPAN class=em4>（</SPAN><SPAN 
class=em4>可能包含最终</SPAN>SDP<SPAN class=em4>）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps38><NOBR><SPAN class=ft9>(<SPAN class=em4>与</SPAN>CALL PRDCEEDING<SPAN 
class=em4>类似</SPAN>)</SPAN></NOBR></SPAN> <SPAN class=ps39><NOBR><SPAN 
class=ft9>RTP<SPAN class=em4>上的介质流</SPAN>(<SPAN 
class=em4>在呼叫接受之</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps40><NOBR><SPAN 
class=ft8>前不保证可以得到呼叫路径<SPAN class=em0>)</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps41><NOBR><SPAN class=ft8>呼叫者确认已经收到成功编码</SPAN></NOBR></SPAN> <SPAN 
class=ps42><NOBR><SPAN class=ft8>成功<SPAN 
class=em8>—用户已接收呼叫</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps43><NOBR><SPAN 
class=ft8>（<SPAN class=em0>ringing</SPAN>进程报告，编码<SPAN class=em0>180<SPAN 
class=em4>）</SPAN></SPAN></SPAN></NOBR></SPAN> <SPAN class=ps44><NOBR><SPAN 
class=ft8>（与<SPAN class=em0>ALERTING</SPAN>类似<SPAN 
class=em0>)</SPAN></SPAN></NOBR></SPAN> </BODY></HTML>
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