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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="003_7.files/left.jpg" width=564 
border=0></DIV>
<DIV class=im1><IMG height=106 src="003_7.files/003_7_2.jpg" width=262 
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<DIV class=im2><IMG height=175 src="003_7.files/003_7_3.jpg" width=314 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>106&nbsp;&nbsp;<SPAN class=em0>IP </SPAN><SPAN 
class=em3>电话技术：稳定的</SPAN><SPAN class=em0>VoIP</SPAN><SPAN 
class=em3>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=em1>3-6 &nbsp;&nbsp;SS7</SPAN>填充信号单元（<SPAN 
class=em1>FISU</SPAN>）</SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft3>MTP3<SPAN class=em2>在第</SPAN>3<SPAN class=em2>层，部分对应于</SPAN>OSI<SPAN 
class=em2>的网络层。每个</SPAN>STP<SPAN class=em2>有一个</SPAN>MTP3<SPAN 
class=em2>，</SPAN><SPAN class=em2>它为</SPAN>SS7<SPAN class=em2>的第</SPAN>4<SPAN 
class=em2>层协议</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps4><NOBR>提供服务，并与<SPAN 
class=em1>MTP2</SPAN>共享联合链路管理。<SPAN class=em1>MTP3</SPAN>之上的第<SPAN 
class=em1>4</SPAN>层协议是用户层或部件层。图<SPAN class=em1>3-3</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR>所示的协议栈说明了两种这样的部件：信令连接控制部件（<SPAN class=em1>Signaling Connection 
Control Part</SPAN>，</NOBR></SPAN> <SPAN class=ps6><NOBR><SPAN 
class=ft3>SCCP<SPAN class=em2>）</SPAN><SPAN class=em2>和</SPAN>ISDN<SPAN 
class=em2>用户部件（<SPAN class=em1>ISDN User Part</SPAN>，<SPAN 
class=em1>ISUP</SPAN>），它们都用在北美。大部分国家使用另一</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR>种电话信令：电话用户部件（<SPAN class=em1>Telephone User Part</SPAN>，<SPAN 
class=em1>TUP</SPAN>），它与<SPAN class=em1>ISUP</SPAN>类似，但是已超出本书</NOBR></SPAN> 
<SPAN class=ps8><NOBR>的讨论范围。在<SPAN class=em1>SS7</SPAN>协议栈中，<SPAN 
class=em1>TUP</SPAN>是和<SPAN class=em1>ISUP</SPAN>同级的。</NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft3>MTP3<SPAN class=em2>负责在</SPAN>STP<SPAN 
class=em2>和</SPAN>MTP<SPAN class=em2>同级用户（例如</SPAN>ISUP<SPAN 
class=em2>或</SPAN>SCCP<SPAN class=em2>）</SPAN><SPAN 
class=em2>之间的信令路由。这叫做信令消</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR>息处理（<SPAN class=em1>Signaling Message Handling</SPAN>，<SPAN 
class=em1>SMH</SPAN>）功能。<SPAN class=em1>MTP3</SPAN>还通过信令网络管理（<SPAN 
class=em1>Signaling</SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft3>Network Management<SPAN class=em2>，</SPAN>SNM<SPAN 
class=em2>）</SPAN><SPAN 
class=em2>功能维护信令流，以防万一发生网络或链路故障。</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft3>ISUP<SPAN 
class=em2>是用于电路交换传递电话呼叫建立消息的协议。该协议还被增强以支持供应商提供</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR>的宽带服务，即宽带<SPAN class=em1>ISUP</SPAN>或<SPAN 
class=em1>B-ISUP</SPAN>。<SPAN 
class=em1>ISUP</SPAN>用于有线和无线网络来控制交换机之间的主干线路。</NOBR></SPAN> <SPAN 
class=ps14><NOBR>与<SPAN class=em1>ISDN Q.931</SPAN>信令协议十分类似，<SPAN 
class=em1>ISUP</SPAN>同时提供基本和增值服务。基本服务控制呼叫建立，</NOBR></SPAN> <SPAN 
class=ps15><NOBR>而增值服务用于已处于稳态的呼叫。</NOBR></SPAN> <SPAN class=ps16><NOBR><SPAN 
class=ft3>ISUP<SPAN class=em2>在基本和增值服务中直接使用</SPAN>MTP<SPAN 
class=em2>，</SPAN><SPAN 
class=em2>但是它也提供交换机之间（不必相邻）的端对</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps17><NOBR>端、呼叫相关的信令能力。这种信令可以直接由<SPAN 
class=em1>MTP</SPAN>用同路传送方法完成，也可以间接通过</NOBR></SPAN> <SPAN 
class=ps18><NOBR>在端对端信令模式下使用<SPAN class=em1>SCCP</SPAN>来完成。</NOBR></SPAN> <SPAN 
class=ps19><NOBR>同路传送、端对端用户信令使用与初始呼叫建立相同的路径。中间的<SPAN 
class=em1>STP</SPAN>产生并中继传播</NOBR></SPAN> <SPAN class=ps20><NOBR>特殊的同路传送消息（<SPAN 
class=em1>Pass-Along Messages</SPAN>，<SPAN 
class=em1>PAM</SPAN>），直到这些消息到达目的地。另一方面，</NOBR></SPAN> <SPAN 
class=ps21><NOBR><SPAN class=ft3>SCCP<SPAN 
class=em2>方法用旁路过程使信令从一端传到另一端，而不考虑通过哪条路径，也不考虑它与建立</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps22><NOBR>呼叫所用路径的关系。</NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft2>图<SPAN class=em1>3-7 
&nbsp;&nbsp;ISUP</SPAN>同路传送消息</SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR>图<SPAN 
class=em1>3-7</SPAN>中是一张同路传送消息图，消息从一个<SPAN class=em1>PC=1</SPAN>的<SPAN 
class=em1>SSP</SPAN>传到另一个<SPAN class=em1>PC=3</SPAN>的<SPAN 
class=em1>SSP</SPAN>。<SPAN class=em1>PAM</SPAN>消</NOBR></SPAN> <SPAN 
class=ps25><NOBR><SPAN class=ft5>7<SPAN class=em4>比特</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps26><NOBR><SPAN class=ft5>7<SPAN 
class=em4>比特</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft5>2<SPAN class=em4>个字节</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps28><NOBR><SPAN class=ft5>5<SPAN 
class=em4>个字节</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps29><NOBR><SPAN 
class=ft6>由<SPAN class=em5>MTP 2</SPAN>产生填充</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR><SPAN class=ft6>信号单元<SPAN 
class=em5>(FISU)</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps31><NOBR><SPAN 
class=ft5>6 LSB</SPAN></NOBR></SPAN> <SPAN class=ps32><NOBR><SPAN 
class=ft6>电路IDA上建立</SPAN></NOBR></SPAN> <SPAN class=ps33><NOBR><SPAN 
class=ft6>的呼叫</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN class=ft5>SS7 
<SPAN class=em4>信令</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps35><NOBR><SPAN 
class=ft5>SS7 <SPAN class=em4>信令</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps36><NOBR><SPAN class=ft6>电路IDB上建立</SPAN></NOBR></SPAN> <SPAN 
class=ps37><NOBR><SPAN class=ft6>的呼叫</SPAN></NOBR></SPAN> </BODY></HTML>

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