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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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<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=469 src="003_37.files/003_37_1.jpg" width=562 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>图<SPAN class=em4>3-26 &nbsp;&nbsp;PSTN</SPAN>上<SPAN 
class=em4>S/MGCP</SPAN>到<SPAN class=em4>H.323</SPAN>的呼叫终止</SPAN></NOBR></SPAN> 
<SPAN class=ps1><NOBR><SPAN class=ft1>TE<SPAN class=em0>发送信号到</SPAN>H.323<SPAN 
class=em0>网关</SPAN>/<SPAN class=em0>关守，说明呼叫到来。</SPAN>GW/GK<SPAN 
class=em0>用第</SPAN>1<SPAN class=em0>章中分析的呼叫流打开一</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps2><NOBR>个<SPAN class=em1>TCP</SPAN>连接，然后用<SPAN 
class=em1>H.245fastStart</SPAN>选项发送<SPAN class=em1>H.225.0 
SETUP</SPAN>消息到被叫端点。这个动作为介质</NOBR></SPAN> <SPAN 
class=ps3><NOBR>流打开一个逻辑信道，并且设置了连接的容量（假定被叫端点支持如前所述的<SPAN class=em1>fastStart<SPAN 
class=em0>，</SPAN></SPAN>否则</NOBR></SPAN> <SPAN class=ps4><NOBR>必须使用正式的<SPAN 
class=em1>H.245</SPAN>信令过程）。被叫端点返回<SPAN 
class=em1>ALERTING</SPAN>消息，说明“虚拟电话”正在振</NOBR></SPAN> <SPAN 
class=ps5><NOBR>铃。这个动作导致<SPAN class=em1>ISUP ACM</SPAN>消息被发送回起始交换机。当它到达<SPAN 
class=em1>MGC</SPAN>时，<SPAN class=em1>RQNT</SPAN>消息发送</NOBR></SPAN> <SPAN 
class=ps6><NOBR>到呼叫端点，要求呼叫端点播放回铃。根据网络设计，回铃也可以从终止交换机或<SPAN 
class=em1>H.323</SPAN>网关</NOBR></SPAN> <SPAN class=ps7><NOBR>播放。</NOBR></SPAN> 
<SPAN class=ps8><NOBR>当被叫方响应了发送过来的呼叫时，会发送自己的</NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft1>CONNECT+fastStart<SPAN 
class=em0>消息到</SPAN>H.323</SPAN></NOBR></SPAN> <SPAN class=ps10><NOBR><SPAN 
class=ft1>GW/GK<SPAN class=em0>，</SPAN><SPAN class=em0>这个动作产生一个</SPAN>ISUP 
ANM<SPAN class=em0>消息，并将它传送到呼叫方的</SPAN>MGC<SPAN class=em0>，</SPAN><SPAN 
class=em0>从而导致回铃音</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR>被删除、到呼叫方的连接转换成全双工。<SPAN class=em1>MGC</SPAN>还用<SPAN 
class=em1>RQNT</SPAN>命令查找来自呼叫方的挂机通知，</NOBR></SPAN> <SPAN 
class=ps12><NOBR>以检测呼叫方何时挂机。这时已经进入通话期，彼此就可以听到对方的声音。</NOBR></SPAN> <SPAN 
class=ps13><NOBR>图<SPAN class=em1>3-26</SPAN>中是呼叫终止，其中呼叫方首先挂机。</NOBR></SPAN> 
<SPAN class=ps14><NOBR>呼叫方挂机后，发送一个通知到<SPAN class=em1>MGC</SPAN>。然后<SPAN 
class=em1>MGC</SPAN>同时向<SPAN class=em1>MG</SPAN>端点和<SPAN 
class=em1>PSTN</SPAN>网关发送<SPAN class=em1>DLCX</SPAN>。</NOBR></SPAN> <SPAN 
class=ps15><NOBR>它还通知端点再次查找摘机。像通常一样，对<SPAN 
class=em1>DLCX</SPAN>的确认包含了连接的性能数据。</NOBR></SPAN> <SPAN 
class=ps16><NOBR>接下来，<SPAN class=em1>MGC</SPAN>向终止交换机发布<SPAN class=em1>ISUP 
REL<SPAN class=em0>（</SPAN>RELEASE<SPAN class=em0>）</SPAN></SPAN>消息，<SPAN 
class=em1>REL</SPAN>到达<SPAN class=em1>H.323</SPAN>网关，导</NOBR></SPAN> <SPAN 
class=ps17><NOBR>致<SPAN class=em1>RELEASE COMPLETE 
H.225.0</SPAN>消息被发送到被叫端点，<SPAN class=em1>H.323</SPAN>网关随后将<SPAN 
class=em1>RCL</SPAN>返回<SPAN class=em1>PSTN</SPAN>网</NOBR></SPAN> <SPAN 
class=ps18><NOBR>关，它会有效地发送终止呼叫的信号。</NOBR></SPAN> <SPAN class=ps19><NOBR>注意：<SPAN 
class=em1>H.225.0</SPAN>消息集不支持<SPAN class=em1>DISCONNECT</SPAN>。如果<SPAN 
class=em1>H.323</SPAN>端点首先挂机，<SPAN class=em1>PSTN</SPAN>上的<SPAN 
class=em1>ISUP</SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR>消息交换机将是一样的。还有，<SPAN 
class=em1>H.323</SPAN>网络设计和信令端点会决定端点和<SPAN 
class=em1>H.323</SPAN>网关及关守之</NOBR></SPAN> <SPAN class=ps21><NOBR><SPAN 
class=ft3>136&nbsp;&nbsp;<SPAN class=em2>IP </SPAN><SPAN 
class=em5>电话技术：稳定的</SPAN><SPAN class=em2>VoIP</SPAN><SPAN 
class=em5>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps22><NOBR><SPAN 
class=ft4>文档</SPAN></NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft5>呼叫端点</SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR><SPAN 
class=ft5>挂机</SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN class=ft6>r<SPAN 
class=em3>：</SPAN><SPAN class=em3>摘机</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps26><NOBR><SPAN class=ft5>性能数据<SPAN 
class=em6>(4)</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft5>性能数据</SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR><SPAN 
class=ft5>接收</SPAN></NOBR></SPAN> <SPAN class=ps29><NOBR><SPAN 
class=ft5>介质网关</SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR><SPAN 
class=ft5>介质网关控制器</SPAN></NOBR></SPAN> <SPAN class=ps31><NOBR><SPAN 
class=ft6>PSTN<SPAN class=em3>网关</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR><SPAN class=ft6>H.323<SPAN 
class=em3>被</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps33><NOBR><SPAN 
class=ft5>叫方</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN 
class=ft6>PSTN<SPAN class=em3>电话</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR><SPAN class=ft5>交换机</SPAN></NOBR></SPAN> <SPAN 
class=ps36><NOBR><SPAN class=ft5>集成的<SPAN 
class=em6>H.323</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps37><NOBR><SPAN 
class=ft5>到<SPAN class=em6>PSTN</SPAN>的网</SPAN></NOBR></SPAN> <SPAN 
class=ps38><NOBR><SPAN class=ft5>关和关守</SPAN></NOBR></SPAN> </BODY></HTML>

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