📄 001_33.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=2 src="001_33.files/001_33_1.jpg" width=134 
border=0></DIV>
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<DIV class=im2><IMG height=64 src="001_33.files/right.jpg" width=563 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>第<SPAN class=em4>1</SPAN>章<SPAN 
class=em4>IP</SPAN>语音和交互应用的协议</SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>33</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN class=ft2>5. <SPAN 
class=em5>会议容量和方法</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft3>到目前为止，已经讨论了<SPAN class=em1>H.323</SPAN>点对点呼叫的直接路由呼叫模型。<SPAN 
class=em1>H.323</SPAN>为召开会议</SPAN></NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN 
class=ft3>提供了广泛的支持，既复杂又健壮。现在讨论使用关守路由的呼叫模型的基本会议呼叫建</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft3>立。</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN 
class=ft3>基本呼叫信令过程以和一个点对点、两方呼叫相同的方式开始。呼叫流如图</SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft2>1-21<SPAN 
class=em0>所示。</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft3>为了简单起见，假定<SPAN class=em1>GK</SPAN>只有一个<SPAN class=em1>MCU<SPAN 
class=em0>，</SPAN></SPAN>所以呼叫重定向对于完成会话呼叫并不重要。否则，</SPAN></NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft3>呼叫会重定向到<SPAN class=em1>GK</SPAN>选择的<SPAN 
class=em1>MCU<SPAN class=em0>，</SPAN></SPAN>呼叫流程通常会和<SPAN 
class=em1>MCU</SPAN>处理呼叫信令一起重新开始。这个</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN 
class=ft3>例子中的会话呼叫在开始时是一个两方呼叫，后来有第三方加入。</SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN class=ft4>图<SPAN class=em6>1-21 &nbsp;&nbsp;H.323 
</SPAN>关守路由会话呼叫模型，初始化</SPAN></NOBR></SPAN> <SPAN class=ps12><NOBR><SPAN 
class=ft3>在阶段<SPAN class=em1>A<SPAN class=em0>，</SPAN></SPAN>发起端点通过<SPAN 
class=em1>B</SPAN>或者<SPAN 
class=em1>A</SPAN>的关守（取决于它们是否处于同一区域、以及其中之一</SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR><SPAN class=ft3>或者两者是否都使用关守）邀请<SPAN class=em1>B</SPAN>。在<SPAN 
class=em1>SETUP</SPAN>消息中，呼叫者插入一个会议<SPAN class=em1>ID<SPAN 
class=em0>，</SPAN></SPAN>在消息中指</SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft3>明<SPAN class=em1>Create</SPAN>。被叫方确认呼叫建立，在阶段<SPAN 
class=em1>B</SPAN>的最后，介质流正流经被分配为处理该呼叫的<SPAN 
class=em1>MCU</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft3>的传输地址（<SPAN class=em1>GK</SPAN>可能有一个或多个<SPAN class=em1>MCU<SPAN 
class=em0>）</SPAN></SPAN>。这时，这是一个简单呼叫，<SPAN 
class=em1>MCU</SPAN>执行空的混合操</SPAN></NOBR></SPAN> <SPAN class=ps16><NOBR><SPAN 
class=ft3>作，直到第三方决定加入会议为止，如图<SPAN class=em1>1-22</SPAN>所示。</SPAN></NOBR></SPAN> 
<SPAN class=ps17><NOBR>会议参与方<SPAN class=em2>A</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR><SPAN class=ft6>IP<SPAN 
class=em7>地址</SPAN>10.0.0.10</SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR>会议参与方<SPAN class=em2>B</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR><SPAN class=ft6>IP<SPAN 
class=em7>地址</SPAN>10.0.0.12</SPAN></NOBR></SPAN> <SPAN class=ps21><NOBR><SPAN 
class=ft6>TCP<SPAN class=em7>端口</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft6>1720</SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR>到<SPAN class=em2>UDP</SPAN>端口</NOBR></SPAN> <SPAN 
class=ps24><NOBR>通过MCU混合和路由</NOBR></SPAN> <SPAN 
class=ps25><NOBR>的介质</NOBR></SPAN> <SPAN class=ps26><NOBR>到<SPAN 
class=em2>UDP</SPAN>端口</NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft6>RTP<SPAN class=em7>上使用</SPAN>MCU<SPAN class=em7>的</SPAN>UDP<SPAN 
class=em7>端口的介质流</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR><SPAN 
class=ft6>RTP<SPAN class=em7>上使用</SPAN>MCU<SPAN class=em7>的</SPAN>UDP<SPAN 
class=em7>端口的介质流</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps29><NOBR>阶段<SPAN 
class=em2>A</SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR>从起始<SPAN 
class=em2>TCP</SPAN>端口<SPAN class=em2>P</SPAN></NOBR></SPAN> <SPAN 
class=ps31><NOBR><SPAN class=ft7>h245-O</SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR>到</NOBR></SPAN> <SPAN class=ps33><NOBR><SPAN class=ft6>GK<SPAN 
class=em7>的</SPAN>TCP<SPAN class=em7>端口</SPAN>P</SPAN></NOBR></SPAN> <SPAN 
class=ps34><NOBR><SPAN class=ft7>GKh245-T</SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR>从<SPAN class=em2>TCP</SPAN>端口<SPAN 
class=em2>P</SPAN></NOBR></SPAN> <SPAN class=ps36><NOBR><SPAN 
class=ft7>h225</SPAN></NOBR></SPAN> <SPAN class=ps37><NOBR>到<SPAN 
class=em2>TCP</SPAN></NOBR></SPAN> <SPAN class=ps38><NOBR>端口<SPAN 
class=em2>GK<SPAN class=em3><SUB>TA</SUB></SPAN>(</SPAN>由<SPAN 
class=em2>GK</SPAN>通过</NOBR></SPAN> <SPAN class=ps39><NOBR><SPAN 
class=ft6>ACR/ACF<SPAN class=em7>得到</SPAN>)</SPAN></NOBR></SPAN> <SPAN 
class=ps40><NOBR>终止<SPAN class=em2>TCP</SPAN>端口</NOBR></SPAN> <SPAN 
class=ps41><NOBR>带<SPAN class=em2>MCU</SPAN>的关守呼叫信令</NOBR></SPAN> <SPAN 
class=ps42><NOBR>传输</NOBR></SPAN> <SPAN class=ps43><NOBR>地址＝<SPAN 
class=em2>GK</SPAN></NOBR></SPAN> <SPAN class=ps44><NOBR><SPAN 
class=ft7>TA</SPAN></NOBR></SPAN> <SPAN class=ps45><NOBR>会议<SPAN class=em2>ID=M, 
</SPAN>创建</NOBR></SPAN> <SPAN class=ps46><NOBR>会议<SPAN class=em2>ID=M, 
</SPAN>创建</NOBR></SPAN> <SPAN class=ps47><NOBR>发送<SPAN 
class=em2>H.245</SPAN>信令的<SPAN class=em2>TA</SPAN></NOBR></SPAN> <SPAN 
class=ps48><NOBR><SPAN class=ft8>文档</SPAN></NOBR></SPAN> </BODY></HTML>
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