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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=64 src="001_34.files/left.jpg" width=564 
border=0></DIV>
<DIV class=im1><IMG height=560 src="001_34.files/001_2_34_2.jpg" width=559 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>图<SPAN class=em5>1-22 
&nbsp;&nbsp;H.323</SPAN>会议呼叫模型，第三个用户加入呼叫</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN class=ft1>当<SPAN class=em1>C</SPAN>方发送<SPAN 
class=em1>SETUP</SPAN>消息到端点<SPAN class=em1>B</SPAN>时，它包含希望加入的会议<SPAN 
class=em1>ID<SPAN class=em0>，</SPAN></SPAN>并在消息中指明<SPAN 
class=em1>Join</SPAN>。端</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN 
class=ft1>点<SPAN class=em1>B</SPAN>不能批准这个请求，因为它没有<SPAN class=em1>MCU<SPAN 
class=em0>，</SPAN></SPAN>所以它拒绝请求，并发送一条<SPAN class=em1>H.225.0 
FACILITY</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft1>消息，指明<SPAN class=em1>routeCallToMC</SPAN>。这种情况也可能是端点<SPAN 
class=em1>C</SPAN>拨入没有<SPAN class=em1>MCU</SPAN>能力的<SPAN 
class=em1>GK</SPAN>。<SPAN class=em1>FACILITY</SPAN>消</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft1>息导致呼叫端点发送<SPAN class=em1>RELEASE COMPLETE<SPAN 
class=em0>，</SPAN></SPAN>并用<SPAN 
class=em1>FACILITY</SPAN>消息返回的传输地址参数重新开</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft1>始呼叫尝试。</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft1>现在，通过<SPAN 
class=em1>GK</SPAN>管理会议的信令和原来两方加入呼叫的情形一样。所提供的<SPAN 
class=em1>H.245</SPAN>传输地</SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft1>址和原来两方使用的一样，<SPAN class=em1>GK</SPAN>中内嵌的<SPAN 
class=em1>MCU</SPAN>为各方完成介质流的混合和交换工作。</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN class=ft1>已经加入会议的一方可以通过发送<SPAN 
class=em1>SETUP</SPAN>命令，并携带<SPAN class=em1>Invite</SPAN>标记和正确的会议<SPAN 
class=em1>ID<SPAN class=em0>，</SPAN></SPAN>来邀</SPAN></NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft1>请第三方加入。呼叫流像其他情况下一样继续。</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft1>在单播模式下，传输地址在呼叫端点和<SPAN 
class=em1>H.245</SPAN>信令（<SPAN class=em1>OpenLogicalChannel</SPAN>）中的<SPAN 
class=em1>MCU</SPAN>之间</SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft2>34&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=ps12><NOBR><SPAN 
class=ft3>文档</SPAN></NOBR></SPAN> <SPAN class=ps13><NOBR>带<SPAN 
class=em7>MCU</SPAN>的关守呼叫</NOBR></SPAN> <SPAN 
class=ps14><NOBR>信令控制</NOBR></SPAN> <SPAN class=ps15><NOBR>地址<SPAN 
class=em7>=GK<SPAN class=em4><SUB>TA</SUB></SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR>会议参与方<SPAN class=em7>B</SPAN></NOBR></SPAN> <SPAN 
class=ps17><NOBR><SPAN class=ft5>IP<SPAN 
class=em3>地址</SPAN>10.0.0.12</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR>会议参与方<SPAN class=em7>C</SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft5>IP<SPAN 
class=em3>地址</SPAN>10.0.0.15</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR>参加会议</NOBR></SPAN> <SPAN class=ps21><NOBR>会议<SPAN 
class=em7>ID=M<SPAN class=em3>，</SPAN></SPAN>加入</NOBR></SPAN> <SPAN 
class=ps22><NOBR>将由<SPAN class=em7>MCU</SPAN>重新打开</NOBR></SPAN> <SPAN 
class=ps23><NOBR>设置<SPAN class=em7>H.245</SPAN>信令的<SPAN 
class=em7>GT</SPAN>传输地址</NOBR></SPAN> <SPAN 
class=ps24><NOBR>交换容量、打开逻辑信道</NOBR></SPAN> <SPAN class=ps25><NOBR>到<SPAN 
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<SPAN class=ps27><NOBR>阶段<SPAN class=em7>A</SPAN></NOBR></SPAN> <SPAN 
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class=em3>端口的介质流</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR><SPAN 
class=ft5>RTP<SPAN class=em3>上使用</SPAN>MCU<SPAN class=em3>的</SPAN>UDP<SPAN 
class=em3>端口的介质流</SPAN></SPAN></NOBR></SPAN> </BODY></HTML>

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