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📁 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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<HTML><HEAD><TITLE>46_48</TITLE>
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<BODY>
<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=64 src="001_48.files/left.jpg" width=564 
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<DIV class=im1><IMG height=427 src="001_48.files/46_48_2.jpg" width=542 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR>剩下的呼叫流程，包括<SPAN 
class=em0>ACK</SPAN>信息在内，都是非常简单的请求和应答，通过<SPAN 
class=em0>sip.remotesysname.</SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>com<SPAN class=em1>来代理。当呼叫建立起来以后，介质会直接在</SPAN>penny@dflx.com<SPAN 
class=em1>和</SPAN>lucy@remotesysname.</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft1>com<SPAN class=em1>之间流动，这一点和</SPAN>S/MGCP<SPAN 
class=em1>、</SPAN>H.323<SPAN class=em1>一样。用传送的</SPAN>BYE<SPAN 
class=em1>请求终止呼叫也可以很容易地</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR>用代理信令完成。</NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN 
class=ft2>图<SPAN class=em5>1-28 
&nbsp;&nbsp;SIP</SPAN>代理呼叫模型</SPAN></NOBR></SPAN> <SPAN class=ps5><NOBR>考虑到<SPAN 
class=em0>SIP</SPAN>中的用户移动性，有一些重要的问题需要考虑。被叫方能够在多个位置同时登</NOBR></SPAN> <SPAN 
class=ps6><NOBR>录，而且所有位置都向<SPAN 
class=em0>sip.remotesysname.com</SPAN>注册过。在这种情况下，服务器很可能把</NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft1>INVITE<SPAN 
class=em1>消息传送给列表中的全部名称，直到第一个成功的终止（<SPAN 
class=em0>RINGING</SPAN>）出现，或者找不</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR>到用户为止。状态信息需要保存。如果<SPAN 
class=em0>lucy</SPAN>允许在多个端点使用自动呼叫回答，在网络中会</NOBR></SPAN> <SPAN 
class=ps9><NOBR>产生有趣的实现问题。</NOBR></SPAN> <SPAN class=ps10><NOBR>在开始的<SPAN 
class=em0>INVITE</SPAN>消息发送到<SPAN 
class=em0>sip.remotesysname.com</SPAN>以后，重定向呼叫模型（见图<SPAN class=em0>1-29<SPAN 
class=em1>）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR>会退化成直接呼叫模型。服务器会返回对<SPAN class=em0>INVITE</SPAN>的重定向应答，使用<SPAN 
class=em0>301</SPAN>或<SPAN class=em0>302</SPAN>编码，说明</NOBR></SPAN> <SPAN 
class=ps12><NOBR>可以在消息体的<SPAN class=em0>Contact</SPAN>域中找到<SPAN 
class=em0>lucy</SPAN>。然后<SPAN class=em0>penny</SPAN>的<SPAN 
class=em0>MGC</SPAN>关闭和<SPAN 
class=em0>sip.remotesysname.com</SPAN>的信</NOBR></SPAN> <SPAN 
class=ps13><NOBR>令服务，发出另一条<SPAN 
class=em0>INVITE</SPAN>到重定向应答中返回的位置。从那时开始，呼叫流变成直接模</NOBR></SPAN> <SPAN 
class=ps14><NOBR>型。</NOBR></SPAN> <SPAN class=ps15><NOBR>如果<SPAN 
class=em0>lucy</SPAN>在多个位置注册，重定向服务器会返回可联系名称的列表。呼叫者应该选定一种</NOBR></SPAN> <SPAN 
class=ps16><NOBR>方式来扫描列表。</NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN 
class=ft1>Contact<SPAN class=em1>域可以作为</SPAN>482<SPAN 
class=em1>应答（提供的模糊名称）的一部分返回。如果</SPAN>URL<SPAN 
class=em1>没有解析成地址，</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft3>48&nbsp;&nbsp;<SPAN class=em2>IP </SPAN><SPAN 
class=em6>电话技术：稳定的</SPAN><SPAN class=em2>VoIP</SPAN><SPAN 
class=em6>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps19><NOBR><SPAN 
class=ft4>文档</SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR><SPAN class=ft5>端点<SPAN 
class=em4>A</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps21><NOBR><SPAN 
class=ft6>user A @ domain 1</SPAN></NOBR></SPAN> <SPAN class=ps22><NOBR><SPAN 
class=ft5>端点<SPAN class=em4>B</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR><SPAN class=ft6>user B @ domain 2</SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft6>ACK user A @ domain 1<SPAN 
class=em3>，</SPAN><SPAN class=em3>同样的</SPAN>Cseq</SPAN></NOBR></SPAN> <SPAN 
class=ps25><NOBR><SPAN class=ft5>（在呼叫接受之前不保证可以得到呼叫路径）</SPAN></NOBR></SPAN> <SPAN 
class=ps26><NOBR><SPAN class=ft6>ACK user A @ domain 1<SPAN 
class=em3>，</SPAN><SPAN class=em3>同样的</SPAN>Cseq</SPAN></NOBR></SPAN> <SPAN 
class=ps27><NOBR><SPAN class=ft5>可能包含最终的<SPAN 
class=em4>SDP</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR><SPAN 
class=ft6>RTP<SPAN class=em3>上的介质流</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft5>如果<SPAN class=em4>INVITE</SPAN>包含“<SPAN 
class=em4>Contact</SPAN>”域，那么应</SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR><SPAN 
class=ft5>答将直接送到“<SPAN class=em4>Contact</SPAN>”中标识的实体</SPAN></NOBR></SPAN> 
<SPAN class=ps31><NOBR><SPAN class=ft6>userB@domain 2<SPAN 
class=em3>的代理</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps32><NOBR><SPAN 
class=ft5>服务器<SPAN class=em4>ps@domain 2</SPAN></SPAN></NOBR></SPAN> 
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