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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_21.files/left.jpg" width=564 
border=0></DIV>
<DIV class=im1><IMG height=3 src="003_21.files/003_21_2.jpg" width=558 
border=0></DIV>
<DIV class=im2><IMG height=2 src="003_21.files/003_21_3.jpg" width=558 
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<DIV class=im4><IMG height=366 src="003_21.files/003_21_5.jpg" width=544 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>120&nbsp;&nbsp;<SPAN class=em0>IP </SPAN><SPAN 
class=em4>电话技术：稳定的</SPAN><SPAN class=em0>VoIP</SPAN><SPAN 
class=em4>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>表<SPAN 
class=em5>3-7 &nbsp;&nbsp;TCAP</SPAN>消息类型</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft3>TCAP<SPAN 
class=em6>事务部分—包类型标识符</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR>单向的</NOBR></SPAN> <SPAN 
class=ps5><NOBR>这种类型的消息不要求事务处理，信息流单向发送，双向消息要求建立事务</NOBR></SPAN> <SPAN 
class=ps6><NOBR>带权限的查询</NOBR></SPAN> <SPAN 
class=ps7><NOBR>初始化一个事务，可以由接收节点终止</NOBR></SPAN> <SPAN 
class=ps8><NOBR>不带权限的查询</NOBR></SPAN> <SPAN 
class=ps9><NOBR>初始化一个事务，不可以由接收节点终止</NOBR></SPAN> <SPAN 
class=ps10><NOBR>应答</NOBR></SPAN> <SPAN class=ps11><NOBR>该消息结束一个<SPAN 
class=em7>TCAP</SPAN>事务</NOBR></SPAN> <SPAN 
class=ps12><NOBR>带权限的会话</NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft3>TCAP<SPAN class=em6>事务的延续，允许由远程节点终止</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR>不带权限的会话</NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft3>TCAP<SPAN class=em6>事务的延续，不允许由远程节点终止</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR>终止</NOBR></SPAN> <SPAN 
class=ps17><NOBR>发送节点终止一个事务，待决的组件被丢弃而不发送</NOBR></SPAN> <SPAN 
class=ps18><NOBR><SPAN class=ft5>举例来说，数据库查询的初始化是一条带有激活（持续<SPAN 
class=em2>|</SPAN>非持续）组件类型标识符（<SPAN class=em1>Invoke</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps19><NOBR><SPAN class=ft5>（<SPAN class=em2>[last| not 
last]</SPAN>）<SPAN class=em2>Component Type Identifier</SPAN>）的<SPAN 
class=em2>TCAP</SPAN>消息。如果标明了“<SPAN 
class=em2>last</SPAN>”，则意味着远</SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR><SPAN 
class=ft5>程系统有完成事务所需要的所有信息。如果标明了“&nbsp;<SPAN class=em2>not 
last</SPAN>”，附加组件会在以后的<SPAN class=em2>TCAP</SPAN>消</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR><SPAN 
class=ft5>息中到达。数字转换是一个组件消息，远程系统的应答终止事务。</SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft5>所有的事务都需要事务<SPAN class=em2>ID<SPAN 
class=em3>，</SPAN></SPAN>但是单向消息不需要。一旦进入会话模式，后来的所有<SPAN 
class=em2>TCAP</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft5>消息都需要等到会话的一方接收到结束事务处理的许可后才会被处理。图<SPAN 
class=em2>3-17</SPAN>中是一个典型</SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR><SPAN 
class=ft5>的<SPAN class=em2>TCAP</SPAN>事务，其中起始应用希望控制事务的结束。</SPAN></NOBR></SPAN> 
<SPAN class=ps25><NOBR><SPAN class=ft6>图<SPAN class=em8>3-17 
&nbsp;&nbsp;</SPAN>典型的<SPAN class=em8>TCAP</SPAN>事务和会话</SPAN></NOBR></SPAN> 
<SPAN class=ps26><NOBR><SPAN class=ft7>7. TCAP<SPAN 
class=em9>中的故障识别和信令</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft7>TCAP<SPAN 
class=em3>负责消息层上的协议错误，以及组件和操作故障。消息故障会在消息的</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps28><NOBR><SPAN class=ft7>P-Abort</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft5>域内表示，并附带表<SPAN 
class=em2>3-8</SPAN>中列出的原因之一。<SPAN class=em2>P-Abort</SPAN>域插入在消息的事务部分，在事务<SPAN 
class=em2>ID</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR><SPAN 
class=ft5>的后面。</SPAN></NOBR></SPAN> <SPAN class=ps31><NOBR>操作<SPAN 
class=em7>PDU</SPAN></NOBR></SPAN> <SPAN class=ps32><NOBR>应用<SPAN 
class=em7>(</SPAN>如<SPAN class=em7>800</SPAN>号</NOBR></SPAN> <SPAN 
class=ps33><NOBR>码转换<SPAN class=em7>)</SPAN></NOBR></SPAN> <SPAN 
class=ps34><NOBR>应用<SPAN class=em7>(</SPAN>如<SPAN 
class=em7>800</SPAN>转换</NOBR></SPAN> <SPAN class=ps35><NOBR>数据库<SPAN 
class=em7>)</SPAN></NOBR></SPAN> <SPAN class=ps36><NOBR><SPAN class=ft3>N<SPAN 
class=em6>单元数据</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps37><NOBR><SPAN 
class=ft3>MTP<SPAN class=em6>传输请示</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps38><NOBR>无权限的查询</NOBR></SPAN> <SPAN 
class=ps39><NOBR>有权限的会话</NOBR></SPAN> <SPAN 
class=ps40><NOBR>（包括转换后的数字）</NOBR></SPAN> <SPAN 
class=ps41><NOBR>应答</NOBR></SPAN> <SPAN class=ps42><NOBR>结束事务</NOBR></SPAN> 
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