📄 001_32.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=64 src="001_32.files/left.jpg" width=564 
border=0></DIV>
<DIV class=im1><IMG height=249 src="001_32.files/001_2_32_2.jpg" width=445 
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<DIV class=im2><IMG height=366 src="001_32.files/001_2_32_3.jpg" width=439 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>一方向的逻辑信道（记住，<SPAN class=em0>H.323</SPAN>信道是半双工的），一旦各自的<SPAN 
class=em0>CloseLogicalChannel ACK</SPAN>消</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN class=ft0>息被交换，正在断开的端点发送一条<SPAN class=em0>H.225.0 RELEASE 
COMPLETE</SPAN>命令，呼叫终止。</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN 
class=ft1>图<SPAN class=em5>1-19 
&nbsp;&nbsp;H.245</SPAN>打开逻辑信道</SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft0>为了说明脱离请求（<SPAN class=em0>Disengage Request</SPAN>，<SPAN 
class=em0>DRQ</SPAN>）<SPAN class=em0>RAS</SPAN>命令的用法，在图<SPAN 
class=em0>1-20</SPAN>中的呼叫流</SPAN></NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN 
class=ft0>的阶段<SPAN class=em0>E<SPAN 
class=em1>，</SPAN></SPAN>显示了已经向它的关守注册了的呼叫端点，。<SPAN 
class=em0>DRQ</SPAN>命令通知关守，该端点已经挂断。</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft2>DRQ<SPAN 
class=em1>不能在端点之间传送。它也不能代替</SPAN>RELEASE COMPLETE<SPAN 
class=em1>命令使用。如果端点事先没</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps6><NOBR><SPAN 
class=ft0>有注册，<SPAN class=em0>GK</SPAN>可以用<SPAN class=em0>DRJ</SPAN>拒绝<SPAN 
class=em0>DRQ</SPAN>。</SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft1>图<SPAN class=em5>1-20 &nbsp;&nbsp;H.323</SPAN>呼叫终止（阶段<SPAN 
class=em5>E<SPAN class=em2>）</SPAN></SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN class=ft3>32&nbsp;&nbsp;<SPAN class=em3>IP </SPAN><SPAN 
class=em6>电话技术：稳定的</SPAN><SPAN class=em3>VoIP</SPAN><SPAN 
class=em6>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft4>文档</SPAN></NOBR></SPAN> <SPAN class=ps10><NOBR>断开和<SPAN 
class=em7>GK</SPAN>的连接</NOBR></SPAN> <SPAN class=ps11><NOBR>可能在接收到<SPAN 
class=em7>CloseLogical Channel ACK</SPAN>之前发送</NOBR></SPAN> <SPAN 
class=ps12><NOBR>关闭视频、数据和音频信道</NOBR></SPAN> <SPAN 
class=ps13><NOBR>关守</NOBR></SPAN> <SPAN class=ps14><NOBR>阶段<SPAN 
class=em7>E<SPAN class=em4>：</SPAN>H.323</SPAN>呼叫终止。由端</NOBR></SPAN> <SPAN 
class=ps15><NOBR>点发起</NOBR></SPAN> <SPAN class=ps16><NOBR>起始<SPAN 
class=em7>TCP</SPAN>端口</NOBR></SPAN> <SPAN class=ps17><NOBR>端口</NOBR></SPAN> 
<SPAN class=ps18><NOBR>终止<SPAN class=em7>TCP</SPAN>端口</NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft6>H.245<SPAN 
class=em4>关闭逻辑信道</SPAN>(3)</SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR><SPAN 
class=ft6>H.245<SPAN class=em4>结束会话命令</SPAN>(2)</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR><SPAN class=ft6>H.245<SPAN 
class=em4>关闭逻辑信道</SPAN>(1)</SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR>呼叫方Ａ</NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft6>IP<SPAN class=em4>地址</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft6>10.0.0.10</SPAN></NOBR></SPAN> <SPAN 
class=ps25><NOBR>被叫方<SPAN class=em7>B </SPAN></NOBR></SPAN><SPAN 
class=ps26><NOBR><SPAN class=ft6>IP<SPAN 
class=em4>地址</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft6>10.0.0.12</SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR>端口</NOBR></SPAN> 
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