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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=im1><IMG height=597 src="001_23.files/001_23_2.jpg" width=559 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>端点，如住宅网关，提供基本的电话服务和多媒体流集成。这只是一个设想而已，这种在</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN class=ft1>LAN<SPAN class=em0>和</SPAN>WAN<SPAN 
class=em0>之间的服务合并提出了很多设计和实现的问题。</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft2>图<SPAN class=em1>1-9 
&nbsp;&nbsp;H.323</SPAN>网络组成和区域的扩展定义</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN 
class=ft0>关守可以向其他区域的关守发送信令，以对呼叫方透明的方式访问其他域中的用户。在</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft0>企业方案中，它对于支持跨国公司的多个场所，或者任何其他<SPAN 
class=em2>LAN</SPAN>网段的地理分布十分重要。</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft0>网关访问<SPAN class=em2>PSTN<SPAN 
class=em0>，</SPAN></SPAN>为<SPAN 
class=em2>POTS</SPAN>用户提供呼叫连接，但是网关也可以提供对不同类型局域网段的访</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft0>问，如<SPAN class=em2>MGCP</SPAN>和<SPAN 
class=em2>SIP</SPAN>域。在本节中，将深入研究与一般情况相关的一些问题。</SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft1>2. <SPAN 
class=em3>系统组成和功能</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft1>H.323<SPAN class=em0>呼叫处理功能分为三个基本方面：使用</SPAN>RAS<SPAN 
class=em0>协议向关守注册、使用</SPAN>H.225.0<SPAN 
class=em0>呼叫信令、</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft3>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=ps10><NOBR><SPAN 
class=ft4>23</SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft5>文档</SPAN></NOBR></SPAN> <SPAN class=ps12><NOBR><SPAN 
class=ft6>H.323<SPAN class=em5>终端</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR>关守<SPAN class=em6>(GK)+MCU</SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR>网关<SPAN class=em6>(GW)</SPAN></NOBR></SPAN> <SPAN 
class=ps15><NOBR>局域网</NOBR></SPAN> <SPAN class=ps16><NOBR>局域网</NOBR></SPAN> 
<SPAN class=ps17><NOBR>介质网关</NOBR></SPAN> <SPAN 
class=ps18><NOBR>交换机/路由器</NOBR></SPAN> <SPAN class=ps19><NOBR>路由</NOBR></SPAN> 
<SPAN class=ps20><NOBR>到其他区域</NOBR></SPAN> <SPAN 
class=ps21><NOBR>路由器</NOBR></SPAN> <SPAN class=ps22><NOBR><SPAN 
class=ft6>H.323<SPAN class=em5>终端可能带有</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR><SPAN class=ft6>MCU</SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft6>H.323<SPAN 
class=em5>多点控制单元</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft6>(MCU)</SPAN></NOBR></SPAN> </BODY></HTML>

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