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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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<BODY>
<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=64 src="001_2_26.files/left.jpg" width=564 
border=0></DIV>
<DIV class=im1><IMG height=482 src="001_2_26.files/001_2_26_2.jpg" width=545 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>Protocol Over ATM<SPAN class=em0>，</SPAN>MPOA<SPAN 
class=em0>），</SPAN><SPAN class=em0>加上将</SPAN>H.323<SPAN 
class=em0>信令发送到远程端点的需要，已经要求</SPAN>WAN<SPAN 
class=em0>链路</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>层协议传输基于<SPAN class=em1>IP</SPAN>的呼叫控制信令。<SPAN 
class=em1>ATM</SPAN>自身能够令人满意地完成这项工作，因为它有不同</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft1>的服务和可靠性分类，以及自己的<SPAN 
class=em1>QoS</SPAN>机制，能够在质量和健壮性方面加强<SPAN 
class=em1>H.323</SPAN>。图中的物</SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft1>理层是一个虚拟层，通常包括跨越多个网络中继段和类型的点对点和广播段的集合。</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft1>图<SPAN class=em1>1-11</SPAN>中是协议在<SPAN 
class=em1>H.323</SPAN>和<SPAN class=em1>SS7</SPAN>或<SPAN 
class=em1>S/MGCP</SPAN>协议协作的一个<SPAN 
class=em1>IP</SPAN>堆栈，仅供参考。协作协议栈</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft1>的前端必须支持<SPAN 
class=em1>H.225.0</SPAN>建立呼叫。虽然低层看起来简单，但是为了适当地将一个协议集合的</SPAN></NOBR></SPAN> 
<SPAN class=ps6><NOBR><SPAN class=ft1>功能延伸到另一个域，在映射功能中实现协作却相当复杂。对于<SPAN 
class=em1>SS7</SPAN>协调工作，希望由<SPAN class=em1>H.323</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps7><NOBR><SPAN class=ft1>网段使用网络元件和过程来控制<SPAN 
class=em1>PSTN</SPAN>信令和干线，而且正如在本书的<SPAN 
class=em1>SS7</SPAN>部分所讨论的那样，</SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft1>以一种对<SPAN class=em1>SS7</SPAN>网络透明的方式进行；也就是说，<SPAN 
class=em1>PSTN</SPAN>并不知道受<SPAN class=em1>GW</SPAN>控制的<SPAN 
class=em1>PSTN</SPAN>信令端点的</SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft1>呼叫信令和介质传输机制。</SPAN></NOBR></SPAN> <SPAN class=ps10><NOBR><SPAN 
class=ft2>图<SPAN class=em3>1-12 &nbsp;&nbsp;H.323</SPAN>呼叫建立，阶段<SPAN 
class=em3>A</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft0>4. <SPAN class=em4>基本</SPAN>H.323<SPAN 
class=em4>呼叫模型</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps12><NOBR><SPAN 
class=ft0>H.323<SPAN 
class=em0>呼叫模型的所有可能的排列情况很多，但在直接路由和关守路由模型中有很多共同</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR><SPAN 
class=ft1>的元件。我们将在点对点的呼叫中讨论直接路由模型，在多方会议中讨论关守路由模型。</SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR><SPAN class=ft0>H.323<SPAN class=em0>的呼叫模型分为</SPAN>5<SPAN 
class=em0>个阶段。</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft3>26&nbsp;&nbsp;<SPAN class=em2>IP </SPAN><SPAN 
class=em5>电话技术：稳定的</SPAN><SPAN class=em2>VoIP</SPAN><SPAN 
class=em5>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps16><NOBR><SPAN 
class=ft4>文档</SPAN></NOBR></SPAN> <SPAN class=ps17><NOBR>呼叫方<SPAN 
class=em6>IP</SPAN>地址</NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft6>10.0.10</SPAN></NOBR></SPAN> <SPAN class=ps19><NOBR><SPAN 
class=ft6>TCP<SPAN class=em7>端口</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR><SPAN class=ft6>TCP<SPAN 
class=em7>端口</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR>请求初始呼叫带宽</NOBR></SPAN> <SPAN class=ps22><NOBR>在<SPAN 
class=em6>TCP</SPAN>连接上</NOBR></SPAN> <SPAN class=ps23><NOBR>请求注册</NOBR></SPAN> 
<SPAN class=ps24><NOBR>注册确认</NOBR></SPAN> <SPAN 
class=ps25><NOBR>呼叫类型和呼叫模型</NOBR></SPAN> <SPAN 
class=ps26><NOBR>请求接受</NOBR></SPAN> <SPAN class=ps27><NOBR>呼叫模型</NOBR></SPAN> 
<SPAN class=ps28><NOBR>接受确认</NOBR></SPAN> <SPAN class=ps29><NOBR><SPAN 
class=ft6>UDP<SPAN class=em7>端口</SPAN>1719</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR><SPAN class=ft6>TCP<SPAN 
class=em7>端口</SPAN>1720</SPAN></NOBR></SPAN> <SPAN class=ps31><NOBR><SPAN 
class=ft6>TCP<SPAN class=em7>端口</SPAN>1720</SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR>接收修改后的呼叫带</NOBR></SPAN> <SPAN class=ps33><NOBR>宽<SPAN 
class=em6>(</SPAN>如果不同<SPAN class=em6>)</SPAN></NOBR></SPAN> <SPAN 
class=ps34><NOBR>在<SPAN class=em6>TCP</SPAN>连接上</NOBR></SPAN> <SPAN 
class=ps35><NOBR><SPAN class=ft6>H.225.0 ALERTING(PDD<SPAN 
class=em7>里程碑</SPAN>)</SPAN></NOBR></SPAN> <SPAN class=ps36><NOBR><SPAN 
class=ft6>H.225.0 CONNECT<SPAN class=em7>在</SPAN>TCP<SPAN 
class=em7>连接上</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps37><NOBR>将<SPAN 
class=em6>P</SPAN></NOBR></SPAN> <SPAN class=ps38><NOBR><SPAN 
class=ft7>245-T</SPAN></NOBR></SPAN> <SPAN class=ps39><NOBR>分配为<SPAN 
class=em6>H.245</SPAN>信令的动态<SPAN class=em6>TCP</SPAN>端口</NOBR></SPAN> <SPAN 
class=ps40><NOBR>终端类型<SPAN class=em6>RAS</SPAN>传输地址，呼叫</NOBR></SPAN> <SPAN 
class=ps41><NOBR>信令地址，终端别名</NOBR></SPAN> <SPAN class=ps42><NOBR>关守<SPAN 
class=em6>IP</SPAN>地址<SPAN class=em6>10.0.0.1</SPAN></NOBR></SPAN> <SPAN 
class=ps43><NOBR><SPAN class=ft6>UDP<SPAN 
class=em7>端口</SPAN>1719</SPAN></NOBR></SPAN> <SPAN class=ps44><NOBR>被叫方<SPAN 
class=em6>IP</SPAN>地址</NOBR></SPAN> <SPAN class=ps45><NOBR><SPAN 
class=ft6>10.0.0.12</SPAN></NOBR></SPAN> </BODY></HTML>

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