📄 003_27.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="003_27.files/left.jpg" width=564 
border=0></DIV>
<DIV class=im1><IMG height=7 src="003_27.files/003_27_2.jpg" width=7 
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<DIV class=im6><IMG height=2 src="003_27.files/003_27_7.jpg" width=134 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>126&nbsp;&nbsp;<SPAN class=em0>IP </SPAN><SPAN 
class=em2>电话技术：稳定的</SPAN><SPAN class=em0>VoIP</SPAN><SPAN 
class=em2>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>文档</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN class=ft2>图<SPAN 
class=em3>3-21 &nbsp;</SPAN>呼叫终止的<SPAN 
class=em3>MGCP</SPAN>信令</SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft3>一般来说，集成包网络有望成为异类网络，因为对每一种主流信令协议都有很强烈的支</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft3>持。行业中最成功的范例是<SPAN 
class=em1>Packet-PSTN-Packet</SPAN>模型，这这个场景中，各种二层信令机制是很</SPAN></NOBR></SPAN> 
<SPAN class=ps5><NOBR><SPAN class=ft3>重要的。住宅<SPAN 
class=em1>MG</SPAN>完成语音、音频带和数据呼叫的信令，在不远的将来还会包括视频。语音支</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft3>持是在支持和模拟黑色电话&nbsp;的<SPAN 
class=em1>POTS</SPAN>服务意义上的。音频带是指调制解调器和传真，而对视</SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft3>频的支持似乎永远被放在标准组著名的“长远考虑”（<SPAN class=em1>Future 
Consideration</SPAN>）状态中。</SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft3>在同类<SPAN class=em1>IP</SPAN>网络中，呼叫可以终止在由同一个<SPAN 
class=em1>MGC</SPAN>服务的端点处，或者不同的<SPAN 
class=em1>MGC</SPAN>服务</SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft3>的远程端点处。在后面的讨论中，需要<SPAN 
class=em1>MGC</SPAN>同步进行呼叫建立、编码解码器和带宽协商，以</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft3>及保证<SPAN 
class=em1>QoS</SPAN>、性能监控和为了收费目的而收集使用数据。<SPAN 
class=em1>MGC</SPAN>同步领域现在相当开放，业界</SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN class=ft3>已经提出了很多提议。主要的设计问题是支持常用<SPAN 
class=em1>ISUP</SPAN>消息集所没有提供的电话性能。</SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft3>首先讨论在同一个<SPAN 
class=em1>MGC</SPAN>上终止的端点之间的呼叫。图<SPAN class=em1>3-20</SPAN>和图<SPAN 
class=em1>3-21</SPAN>中是这样的例子。表</SPAN></NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft4>3-9<SPAN 
class=em4>列出了命令和应答，以及一些与诊断和信令交换故障的可能处理有关的注释。</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR>行业术语“黑色电话”表示一般的电话服务，它具有<SPAN class=em5>5</SPAN>类特性的一些或者全部。<SPAN 
class=em5>5</SPAN>类特性集到黑色电话的传</NOBR></SPAN> <SPAN 
class=ps15><NOBR>输已经超出了本书的范围。</NOBR></SPAN> <SPAN 
class=ps16><NOBR>在绝大多数情况下，起始和终止<SPAN 
class=em5>MGC</SPAN>可以属于不同的服务供应商。这和我们讨论的流无关。</NOBR></SPAN> <SPAN 
class=ps17><NOBR>用户<SPAN class=em5>1</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR>用户<SPAN class=em5>2</SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR>挂机</NOBR></SPAN> <SPAN class=ps20><NOBR>端点<SPAN 
class=em5>2</SPAN></NOBR></SPAN> <SPAN class=ps21><NOBR>介质网关控制器</NOBR></SPAN> 
<SPAN class=ps22><NOBR>呼叫终止阶段</NOBR></SPAN> <SPAN 
class=ps23><NOBR>用户挂机</NOBR></SPAN> <SPAN class=ps24><NOBR>查找摘机</NOBR></SPAN> 
<SPAN class=ps25><NOBR>包括LCP性能参数</NOBR></SPAN> <SPAN 
class=ps26><NOBR>用户已挂机</NOBR></SPAN> <SPAN class=ps27><NOBR>挂机</NOBR></SPAN> 
<SPAN class=ps28><NOBR>再次查找摘机</NOBR></SPAN> <SPAN class=ps29><NOBR>端点<SPAN 
class=em5>1</SPAN></NOBR></SPAN> </BODY></HTML>
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