001_28.htm

来自「通讯类的标准。对要开发SS7的朋友有很大帮助的。（通讯协议）」· HTM 代码 · 共 255 行
HTM
255 行
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<BODY>
<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=64 src="001_28.files/left.jpg" width=564 
border=0></DIV>
<DIV class=im1><IMG height=426 src="001_28.files/001_2_28_2.jpg" width=540 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>第一个交换集显示了在<SPAN class=em1>A</SPAN>和<SPAN class=em1>B</SPAN>所熟知的<SPAN 
class=em1>TSAP</SPAN>之间打开一个<SPAN class=em1>TCP</SPAN>连接。<SPAN 
class=em1>TSAP</SPAN>是<SPAN class=em1>H.323</SPAN>传输层</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN class=ft0>服务接入点，即<SPAN class=em1>TCP</SPAN>端口号<SPAN 
class=em1>1720</SPAN>。一旦被叫方返回<SPAN class=em1>TCP-ACK<SPAN 
class=em0>，</SPAN></SPAN>表示连接已经建立，呼叫信令</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft0>就可以开始了。就性能而言，<SPAN 
class=em1>TCP</SPAN>连接打开过程的开销是很大的，因为它需要一圈半路程的</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft0>时间和在两端必须的协议处理。</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft0>在新的<SPAN class=em1>TCP</SPAN>连接上发送的第一条消息是<SPAN 
class=em1>H.225.0</SPAN>的<SPAN class=em1>SETUP</SPAN>消息。<SPAN 
class=em1>H.225.0</SPAN>消息集是<SPAN class=em1>ITU-T</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps5><NOBR><SPAN class=ft1>Q.931<SPAN 
class=em0>协议的子集。该消息包含发起端点请求的呼叫类型，例如点对点或多点、会话呼叫的可</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps6><NOBR><SPAN 
class=ft0>能建立、呼叫端的传输地址、介质通道（还未打开）的安全性能，以及对快速连接过程的可</SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft0>能请求，即<SPAN 
class=em1>fastStart</SPAN>等。将在后面讨论后一过程，但在这个例子中，基本的<SPAN class=em1>H.225.0/ 
H.245</SPAN>信</SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft0>令应用贯彻呼叫建立阶段的始终。</SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft0>如果在该网络地址并不存在终端，例如它关闭电源或者从网络上断开，呼叫端的<SPAN 
class=em1>H.225.0</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps10><NOBR><SPAN 
class=ft1>SETUP<SPAN 
class=em0>计时器会超时，呼叫尝试被中断。如果该终端可以访问，但忙于另一呼叫，它将返回</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps11><NOBR><SPAN class=ft0>一条<SPAN class=em1>RELEASE 
COMPLETE</SPAN>消息，并说明拒绝呼叫的理由。如果该终端处于空闲状态，信令</SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft0>过程以一个或多个<SPAN 
class=em1>RAS</SPAN>信息交换开始。</SPAN></NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft0>如果该终端还没有向一个<SPAN class=em1>GK</SPAN>注册，这时是用注册请求（&nbsp;<SPAN 
class=em1>RegistrationRequest</SPAN>，<SPAN 
class=em1>RRQ</SPAN>）</SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft1>RAS<SPAN class=em0>消息注册的最佳时机。</SPAN>RRQ/RCF<SPAN 
class=em0>交换并不是呼叫处理的一部分，它通常在一个终端希望</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps15><NOBR><SPAN class=ft0>根据启动或操作命令向<SPAN 
class=em1>GK</SPAN>注册时出现。这种方法可以注册终端类型、传输地址、所有别名以</SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR><SPAN class=ft0>及信令地址。<SPAN class=em1>GK</SPAN>可能拒绝接受<SPAN 
class=em1>RRQ<SPAN class=em0>，</SPAN></SPAN>发出<SPAN 
class=em1>RRJ</SPAN>。在这种情况下，该终端必须找另外一个<SPAN 
class=em1>GK</SPAN>注</SPAN></NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN 
class=ft2>28&nbsp;&nbsp;<SPAN class=em2>IP </SPAN><SPAN 
class=em4>电话技术：稳定的</SPAN><SPAN class=em2>VoIP</SPAN><SPAN 
class=em4>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft3>文档</SPAN></NOBR></SPAN> <SPAN class=ps19><NOBR><SPAN class=ft4>图<SPAN 
class=em5>1-14 &nbsp;&nbsp;H.323</SPAN>呼叫建立，阶段<SPAN 
class=em5>E</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR><SPAN 
class=ft5>起始<SPAN class=em6>TCP</SPAN>端口</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR><SPAN class=ft5>端口</SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft5>端口</SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR><SPAN class=ft5>终止<SPAN 
class=em6>TCP</SPAN>端口</SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR><SPAN 
class=ft5>阶段<SPAN class=em6>E<SPAN 
class=em3>：</SPAN>H.323</SPAN>呼叫终止。由端点发起</SPAN></NOBR></SPAN> <SPAN 
class=ps25><NOBR><SPAN class=ft5>断开和<SPAN 
class=em6>GK</SPAN>的连接</SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN 
class=ft5>关守</SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft5>可能在接收到<SPAN class=em6>CloseLogicalChannel 
ACK</SPAN>之前发送</SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR><SPAN 
class=ft6>H.245<SPAN class=em3>关闭逻辑信道</SPAN>(1)</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft6>H.245<SPAN 
class=em3>关闭逻辑信道</SPAN>(3)</SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR><SPAN 
class=ft6>H.245<SPAN class=em3>结束会话命令</SPAN>(2)</SPAN></NOBR></SPAN> <SPAN 
class=ps31><NOBR><SPAN class=ft5>关闭视频、数据和音频信道</SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR><SPAN class=ft5>呼叫方Ａ</SPAN></NOBR></SPAN> <SPAN 
class=ps33><NOBR><SPAN class=ft6>IP<SPAN 
class=em3>地址</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN 
class=ft6>10.0.0.10</SPAN></NOBR></SPAN> <SPAN class=ps35><NOBR><SPAN 
class=ft5>被叫方<SPAN class=em6>B </SPAN></SPAN></NOBR></SPAN><SPAN 
class=ps36><NOBR><SPAN class=ft6>IP<SPAN 
class=em3>地址</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps37><NOBR><SPAN 
class=ft6>10.0.0.12</SPAN></NOBR></SPAN> </BODY></HTML>
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