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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=3 src="003_16.files/003_16_1.jpg" width=558 
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<DIV class=im1><IMG height=2 src="003_16.files/003_16_2.jpg" width=144 
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<DIV class=im3><IMG height=64 src="003_16.files/right.jpg" width=563 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>（续）</SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>ISUP<SPAN class=em1>消息</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft2>意</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft2>义</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft2>备</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft2>注</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft2>编码</SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft1>GRA</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN class=ft1>GRS</SPAN></NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft1>IAM</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft1>INF</SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN class=ft1>INR</SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft1>LPA</SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR><SPAN class=ft1>PAM</SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR><SPAN class=ft1>REL</SPAN></NOBR></SPAN> <SPAN 
class=ps15><NOBR><SPAN class=ft1>RES</SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR><SPAN class=ft1>RLC</SPAN></NOBR></SPAN> <SPAN 
class=ps17><NOBR><SPAN class=ft1>RSC</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR><SPAN class=ft1>SUS</SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft1>UBA</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR><SPAN class=ft1>UBL</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR><SPAN class=ft1>UCIC</SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft3>呼叫建立和终止的四种基本消息是<SPAN class=em2>IAM</SPAN>、<SPAN 
class=em2>ACM</SPAN>、<SPAN class=em2>ANM</SPAN>、<SPAN class=em2>REL</SPAN>和<SPAN 
class=em2>RLC</SPAN>。<SPAN class=em2>ISDN</SPAN>和<SPAN 
class=em2>ISUP</SPAN>消息</SPAN></NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft3>之间的映射并不复杂，但是读者从表<SPAN class=em2>3-4</SPAN>中可以了解到，很多<SPAN 
class=em2>ISUP</SPAN>消息涉及到交换机之间的控</SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft3>制信令，不会直接被转换成<SPAN 
class=em2>ISDN</SPAN>消息。在本章稍后我们将讨论一个呼叫建立的<SPAN class=em2>ISUP</SPAN>和<SPAN 
class=em2>MGCP</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft3>信令的实例。</SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN class=ft4>3.2 
&nbsp;&nbsp;SSCP<SPAN class=em3>和</SPAN>TCAP<SPAN 
class=em3>服务</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft3>迄今为止已经讨论了与<SPAN class=em2>PSTN</SPAN>上呼叫方和被叫方间物理电路的建立有关的<SPAN 
class=em2>SS7/ISUP</SPAN>信令。</SPAN></NOBR></SPAN> <SPAN class=ps28><NOBR><SPAN 
class=ft3>如前所述，语音电话需要公用网提供电路建立之上的服务，包括用于收费目的的客户信息、</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft5>第<SPAN 
class=em4>3</SPAN>章&nbsp;语音电话的基本呼叫控制</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR><SPAN class=ft6>115</SPAN></NOBR></SPAN> <SPAN 
class=ps31><NOBR><SPAN class=ft7>文档</SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR>组重置确认</NOBR></SPAN> <SPAN class=ps33><NOBR>(<SPAN 
class=em0>Group Reset Acknowledgement</SPAN>)</NOBR></SPAN> <SPAN 
class=ps34><NOBR>组重置</NOBR></SPAN> <SPAN class=ps35><NOBR>（<SPAN class=em0>Group 
Reset</SPAN>）</NOBR></SPAN> <SPAN class=ps36><NOBR>初始地址消息</NOBR></SPAN> <SPAN 
class=ps37><NOBR>（<SPAN class=em0>Initial Address Message</SPAN>）</NOBR></SPAN> 
<SPAN class=ps38><NOBR>信息</NOBR></SPAN> <SPAN class=ps39><NOBR>（<SPAN 
class=em0>Information</SPAN>）</NOBR></SPAN> <SPAN 
class=ps40><NOBR>信息请求</NOBR></SPAN> <SPAN class=ps41><NOBR>（<SPAN 
class=em0>Information Request</SPAN>）</NOBR></SPAN> <SPAN 
class=ps42><NOBR>回环确认</NOBR></SPAN> <SPAN class=ps43><NOBR>（<SPAN 
class=em0>Loopback Acknowledgement</SPAN>）</NOBR></SPAN> <SPAN 
class=ps44><NOBR>同路传送消息</NOBR></SPAN> <SPAN class=ps45><NOBR>（<SPAN 
class=em0>Pass-Along Message</SPAN>）</NOBR></SPAN> <SPAN 
class=ps46><NOBR>释放</NOBR></SPAN> <SPAN class=ps47><NOBR>（<SPAN 
class=em0>Release</SPAN>）</NOBR></SPAN> <SPAN class=ps48><NOBR>恢复</NOBR></SPAN> 
<SPAN class=ps49><NOBR>（<SPAN class=em0>Resume</SPAN>）</NOBR></SPAN> <SPAN 
class=ps50><NOBR>释放结束</NOBR></SPAN> <SPAN class=ps51><NOBR>（<SPAN 
class=em0>Release Complete</SPAN>）</NOBR></SPAN> <SPAN 
class=ps52><NOBR>重置电路</NOBR></SPAN> <SPAN class=ps53><NOBR>（<SPAN 
class=em0>Reset Circuit</SPAN>）</NOBR></SPAN> <SPAN 
class=ps54><NOBR>挂起</NOBR></SPAN> <SPAN class=ps55><NOBR>（<SPAN 
class=em0>Suspend</SPAN>）</NOBR></SPAN> <SPAN 
class=ps56><NOBR>解除阻塞确认</NOBR></SPAN> <SPAN class=ps57><NOBR>（<SPAN 
class=em0>Unblocking Acknowledgement</SPAN>）</NOBR></SPAN> <SPAN 
class=ps58><NOBR>解除阻塞</NOBR></SPAN> <SPAN class=ps59><NOBR>（<SPAN 
class=em0>Unblocking</SPAN>）</NOBR></SPAN> <SPAN 
class=ps60><NOBR>不配置电路标识符编码</NOBR></SPAN> <SPAN class=ps61><NOBR>（<SPAN 
class=em0>Unequipped Circuit </SPAN></NOBR></SPAN><SPAN class=ps62><NOBR><SPAN 
class=ft9>Indentification Code<SPAN class=em1>）</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps63><NOBR>确认<SPAN class=em0>GRS</SPAN>命令</NOBR></SPAN> <SPAN 
class=ps64><NOBR>用和<SPAN class=em0>RSC</SPAN>命令类似的方式重置一</NOBR></SPAN> <SPAN 
class=ps65><NOBR>组电路。带一组参数</NOBR></SPAN> <SPAN 
class=ps66><NOBR>提供电路信息、载波</NOBR></SPAN> <SPAN class=ps67><NOBR><SPAN 
class=ft9>I D<SPAN class=em1>和其他</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps68><NOBR>完成呼叫所需要的信息。用来建立</NOBR></SPAN> <SPAN 
class=ps69><NOBR>呼叫</NOBR></SPAN> <SPAN class=ps70><NOBR>提供<SPAN 
class=em0>INR</SPAN>需要的信息，提供重定向</NOBR></SPAN> <SPAN 
class=ps71><NOBR>和收费号码</NOBR></SPAN> <SPAN 
class=ps72><NOBR>由交换机发送，请求正在进行的</NOBR></SPAN> <SPAN 
class=ps73><NOBR>呼叫的其他信息。用于转发</NOBR></SPAN> <SPAN class=ps74><NOBR>确认由于<SPAN 
class=em0>CCR</SPAN>消息已经执行回环。</NOBR></SPAN> <SPAN class=ps75><NOBR><SPAN 
class=ft9>CIC<SPAN class=em1>域中包含电路</SPAN>ID</SPAN></NOBR></SPAN> <SPAN 
class=ps76><NOBR>通常以另一个消息为参数</NOBR></SPAN> <SPAN 
class=ps77><NOBR>说明呼叫已经终止</NOBR></SPAN> <SPAN class=ps78><NOBR>对于非<SPAN 
class=em0>ISDN</SPAN>方，这条消息说明一</NOBR></SPAN> <SPAN 
class=ps79><NOBR>方已挂机，但是又迅速摘机，不应</NOBR></SPAN> <SPAN 
class=ps80><NOBR>该终止呼叫。如果不能在规定的时</NOBR></SPAN> <SPAN 
class=ps81><NOBR>间内回到摘机状态，那么将发送<SPAN class=em0>SUS</SPAN></NOBR></SPAN> <SPAN 
class=ps82><NOBR>消息</NOBR></SPAN> <SPAN class=ps83><NOBR>说明接收到<SPAN 
class=em0>REL</SPAN>消息，可以释放</NOBR></SPAN> <SPAN 
class=ps84><NOBR>电路，回到空闲等待状态</NOBR></SPAN> <SPAN 
class=ps85><NOBR>将请求的电路设为重置状态。用</NOBR></SPAN> <SPAN 
class=ps86><NOBR>于交换机不知道电路状态时</NOBR></SPAN> <SPAN class=ps87><NOBR>当非<SPAN 
class=em5>I S D N</SPAN>方挂起时，首先发送</NOBR></SPAN> <SPAN class=ps88><NOBR><SPAN 
class=ft9>SUS<SPAN class=em1>消息，接着是</SPAN>REL<SPAN 
class=em1>消息</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps89><NOBR>确认一条<SPAN 
class=em0>UBL</SPAN>消息</NOBR></SPAN> <SPAN 
class=ps90><NOBR>从电路中删除阻塞条件</NOBR></SPAN> <SPAN class=ps91><NOBR>说明没有配置请求的<SPAN 
class=em0>CIC</SPAN></NOBR></SPAN> </BODY></HTML>
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