📄 001_40.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=im4><IMG height=275 src="001_40.files/001_2_40_5.jpg" width=458 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>端点发送<SPAN class=em0>ALERTING</SPAN>消息，以说明它正处于报警模式，也就是说，<SPAN 
class=em0>H.323</SPAN>终点的虚拟“电</SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft0>话”正在震铃。一旦呼叫代理程序从<SPAN class=em0>H.323</SPAN>网关接收到<SPAN 
class=em0>ALERTING<SPAN class=em1>，</SPAN></SPAN>它指示<SPAN 
class=em0>S/MGCP</SPAN>端点回铃</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN 
class=ft0>（<SPAN class=em0>13</SPAN>步到<SPAN 
class=em0>14</SPAN>步）。回铃是远端的电话震铃时，我们能够听到的铃声，但是在使用<SPAN 
class=em0>S/MGCP</SPAN>协议</SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft0>时，本地听得见的回铃可能通过从呼叫代理程序到<SPAN 
class=em0>MG</SPAN>端点的命令产生。</SPAN></NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN 
class=ft0>当被叫用户拾音时，带有<SPAN class=em0>fastStart</SPAN>选项的<SPAN 
class=em0>CONNECT</SPAN>消息被送到网关（第<SPAN 
class=em0>15</SPAN>步），它会在</SPAN></NOBR></SPAN> <SPAN class=ps5><NOBR><SPAN 
class=ft1>S/MGCP<SPAN class=em1>端引起协议转换，用</SPAN>MDCX<SPAN 
class=em1>命令把连接转换成全双工（第</SPAN>16<SPAN 
class=em1>步），并且执行载体流穿</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps6><NOBR><SPAN 
class=ft0>通。如呼叫流图中所示，<SPAN class=em0>MDCX</SPAN>命令可以带有背负式通知请求（<SPAN 
class=em0>RQNT</SPAN>）。这时，两个用户都</SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft0>可以听到对方，进入通话过程。</SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft0>如图<SPAN class=em0>1-25</SPAN>所示，呼叫终止很简单。在这个例子中，呼叫方首先挂机。第<SPAN 
class=em0>1</SPAN>步到第<SPAN class=em0>4</SPAN>步显示</SPAN></NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft0>了通知<SPAN class=em0>MGC</SPAN>挂机事件，随后删除连接。<SPAN 
class=em0>MGC</SPAN>向端点发送<SPAN class=em0>RELEASE 
COMPLETE</SPAN>信令终止呼叫。</SPAN></NOBR></SPAN> <SPAN class=ps10><NOBR><SPAN 
class=ft0>其中<SPAN 
class=em0>ReleaseCompleteReason</SPAN>编码说明正常完成（用户挂机）。然后，远程的<SPAN 
class=em0>H.323</SPAN>网关发送</SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft1>DRQ<SPAN class=em1>（</SPAN>disengagement Request<SPAN 
class=em1>，</SPAN><SPAN class=em1>脱离请求），接收到脱离确认（<SPAN class=em0>Disengagement 
ConFirm</SPAN>，<SPAN class=em0>DCF</SPAN>）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft0>。</SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR><SPAN class=ft0>它向<SPAN 
class=em0>GK</SPAN>发送端点正在中断的信号，然后关闭<SPAN 
class=em0>TCP</SPAN>连接。</SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft2>图<SPAN class=em3>1-25 &nbsp;&nbsp;RGW</SPAN>到<SPAN 
class=em3>H.323</SPAN>的呼叫终止</SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft1>12. H.225.0<SPAN class=em4>协议消息</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR><SPAN class=ft0>如前所述，呼叫管理消息是在<SPAN 
class=em0>TCP</SPAN>连接上发送的。<SPAN class=em0>H.225.0</SPAN>支持一个<SPAN 
class=em0>Q.931/Q.932</SPAN>协议子集，</SPAN></NOBR></SPAN> <SPAN 
class=ps17><NOBR><SPAN class=ft0>表<SPAN class=em0>1-11</SPAN>中列出以供参考。<SPAN 
class=em0>I.451/Q.931</SPAN>的电路模式连接控制（<SPAN class=em0>Circuit Mode Connection 
Control</SPAN>，</SPAN></NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft1>CMCC<SPAN class=em1>）</SPAN><SPAN 
class=em1>过程以后是呼叫建立阶段。有关消息、信息单元和它们的使用的讨论只是为了提供</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft0>一些信息。<SPAN 
class=em0>ITU</SPAN>规范中包含了消息的确切定义和编码。</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR><SPAN class=ft3>表<SPAN class=em5>1-11 
&nbsp;&nbsp;H.225.0</SPAN>消息集</SPAN></NOBR></SPAN> <SPAN class=ps21><NOBR><SPAN 
class=ft4>Q.931/Q.932<SPAN class=em6>消息</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft4>T X <SPAN 
class=em6>支持</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft4>R X <SPAN class=em6>支持</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR>有效范围</NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft4>Alerting</SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN 
class=ft4>M</SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft4>M</SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR>全局</NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft4>Call Proceeding</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR><SPAN class=ft4>O</SPAN></NOBR></SPAN> <SPAN 
class=ps31><NOBR>有条件</NOBR></SPAN> <SPAN class=ps32><NOBR>局部</NOBR></SPAN> <SPAN 
class=ps33><NOBR><SPAN class=ft4>Connect</SPAN></NOBR></SPAN> <SPAN 
class=ps34><NOBR><SPAN class=ft4>M</SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR><SPAN class=ft4>M</SPAN></NOBR></SPAN> <SPAN 
class=ps36><NOBR>全局</NOBR></SPAN> <SPAN class=ps37><NOBR><SPAN class=ft4>Connect 
Acknowledge</SPAN></NOBR></SPAN> <SPAN class=ps38><NOBR>不允许</NOBR></SPAN> <SPAN 
class=ps39><NOBR>不允许</NOBR></SPAN> <SPAN class=ps40><NOBR><SPAN 
class=ft4>N/A</SPAN></NOBR></SPAN> <SPAN class=ps41><NOBR><SPAN 
class=ft4>Progress</SPAN></NOBR></SPAN> <SPAN class=ps42><NOBR><SPAN 
class=ft4>O</SPAN></NOBR></SPAN> <SPAN class=ps43><NOBR><SPAN 
class=ft4>O</SPAN></NOBR></SPAN> <SPAN class=ps44><NOBR>全局</NOBR></SPAN> <SPAN 
class=ps45><NOBR><SPAN class=ft6>40&nbsp;&nbsp;<SPAN class=em2>IP </SPAN><SPAN 
class=em7>电话技术：稳定的</SPAN><SPAN class=em2>VoIP</SPAN><SPAN 
class=em7>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps46><NOBR><SPAN 
class=ft7>文档</SPAN></NOBR></SPAN> <SPAN class=ps47><NOBR><SPAN 
class=ft8>用户</SPAN></NOBR></SPAN> <SPAN class=ps48><NOBR><SPAN 
class=ft8>在线</SPAN></NOBR></SPAN> <SPAN class=ps49><NOBR><SPAN 
class=ft8>介质网关</SPAN></NOBR></SPAN> <SPAN class=ps50><NOBR><SPAN 
class=ft8>从通话期开始</SPAN></NOBR></SPAN> <SPAN class=ps51><NOBR><SPAN 
class=ft8>再次查找离线</SPAN></NOBR></SPAN> <SPAN class=ps52><NOBR><SPAN 
class=ft8>性能数据</SPAN></NOBR></SPAN> <SPAN class=ps53><NOBR><SPAN 
class=ft8>（正常）</SPAN></NOBR></SPAN> <SPAN class=ps54><NOBR><SPAN 
class=ft8>结束<SPAN class=em8>TCP</SPAN>会话</SPAN></NOBR></SPAN> <SPAN 
class=ps55><NOBR><SPAN class=ft8>关守</SPAN></NOBR></SPAN> <SPAN 
class=ps56><NOBR><SPAN class=ft9>H.323<SPAN 
class=em6>终端</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps57><NOBR><SPAN 
class=ft8>介质网关控制器</SPAN></NOBR></SPAN> </BODY></HTML>
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