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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=631 src="003_20.files/003_20_2.jpg" width=302 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR>在载波级别上，基于<SPAN 
class=em0>IP</SPAN>的电话面临的问题的中心是定义传输和路由方法和类似<SPAN 
class=em0>SCCP</SPAN>的服务。</NOBR></SPAN> <SPAN 
class=ps1><NOBR>这些问题的解决会影响任何一个新的<SPAN 
class=em0>MTP</SPAN>层的定义（如果已经定义的话），但是在一些实现中，</NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft1>MTP<SPAN 
class=em1>不大可能会被某种形式的标准的基于</SPAN>IP<SPAN 
class=em1>的路由所取代。如果体系结构的分割方式保存了</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft1>SCCP<SPAN class=em1>和</SPAN>MTP<SPAN 
class=em1>之间的接口定义，那么就可以大大降低转移的痛苦，<SPAN 
class=em0>SS7</SPAN>编码的主要部分都可以重新</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR>使用。这将有益于<SPAN 
class=em0>IP</SPAN>电话，因为它可以用已有的稳定的方法发送信号，同时允许新的电话服务在</NOBR></SPAN> <SPAN 
class=ps5><NOBR>它的优势领域发挥作用，例如带宽利用和服务集成。</NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft1>5. TCAP<SPAN 
class=em2>协议和服务</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft1>SS7<SPAN class=em1>的事务性能应用部件（&nbsp;<SPAN 
class=em0>Tran&nbsp;-</SPAN></SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN class=ft1>saction Capabilities Application Part&nbsp;<SPAN 
class=em1>，</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft1>TCAP<SPAN class=em1>）</SPAN><SPAN 
class=em1>通过相对简单的消息集使数据</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR>库查询和对话更为便利。<SPAN class=em0>TCAP</SPAN>允许网</NOBR></SPAN> <SPAN 
class=ps11><NOBR>络操作员访问数据库和交换机，以交换</NOBR></SPAN> <SPAN 
class=ps12><NOBR>和呼叫相关、但和语音电路建立无关的</NOBR></SPAN> <SPAN 
class=ps13><NOBR>信息。它支持使用无连接模式<SPAN class=em0>SCCP</SPAN>的</NOBR></SPAN> <SPAN 
class=ps14><NOBR>端到端信令，还可以提供可靠的端到端</NOBR></SPAN> <SPAN 
class=ps15><NOBR>通信方法。<SPAN class=em0>L N P</SPAN>查询可移植号码、</NOBR></SPAN> <SPAN 
class=ps16><NOBR><SPAN class=ft1>800/900<SPAN 
class=em1>号码转换、无线漫游、呼叫收费</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps17><NOBR>信息等功能使用<SPAN class=em0>PSTN</SPAN>中的<SPAN 
class=em0>TCAP/SCCP</SPAN>。</NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft1>TCAP<SPAN class=em1>也允许高级智能网络特性和呼叫</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR>模型的设计和实现，其中一些在新的集</NOBR></SPAN> <SPAN 
class=ps20><NOBR>成包网络中可能仍然相关。</NOBR></SPAN> <SPAN class=ps21><NOBR><SPAN 
class=ft1>SS7<SPAN class=em1>网络中的事务在</SPAN>2<SPAN 
class=em1>个层次上指</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR>定。最高层是应用到应用，其中应用</NOBR></SPAN> <SPAN 
class=ps23><NOBR>通过一个过程和依赖于实现的接口与</NOBR></SPAN> <SPAN class=ps24><NOBR><SPAN 
class=ft1>TCAP<SPAN class=em1>交互。下一层是</SPAN>TCAP<SPAN 
class=em1>到</SPAN>TCAP<SPAN class=em1>。</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps25><NOBR><SPAN class=ft1>6. TCAP<SPAN 
class=em2>消息类型、格式和功能</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN 
class=ft1>TCAP<SPAN class=em1>消息分为三部分：事务、会</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps27><NOBR>话和组件。第一部分通过事务<SPAN class=em0>ID</SPAN>来标识</NOBR></SPAN> <SPAN 
class=ps28><NOBR>事务，事务<SPAN class=em0>ID</SPAN>可以用来引用所有与事务</NOBR></SPAN> <SPAN 
class=ps29><NOBR>有关的<SPAN class=em0>TCAP</SPAN>消息。它只是局部有效。</NOBR></SPAN> <SPAN 
class=ps30><NOBR>会话部分在<SPAN class=em0>TCAP</SPAN>中是可选的，用于版</NOBR></SPAN> <SPAN 
class=ps31><NOBR>本标识和使用加密时的安全。组件部分</NOBR></SPAN> <SPAN 
class=ps32><NOBR>包括操作协议数据单元（<SPAN class=em0>Protocol Data</SPAN></NOBR></SPAN> 
<SPAN class=ps33><NOBR><SPAN class=ft1>Unit<SPAN class=em1>，</SPAN>PDU<SPAN 
class=em1>）</SPAN><SPAN class=em1>从与</SPAN>TCAP<SPAN 
class=em1>的接口处接收</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps34><NOBR>到的数据。同级应用使用这些数据来初</NOBR></SPAN> <SPAN 
class=ps35><NOBR>始化局部操作，例如数据库查询。</NOBR></SPAN> <SPAN class=ps36><NOBR>图<SPAN 
class=em0>3-16</SPAN>中是一条<SPAN class=em0>TCAP</SPAN>消息的结构，</NOBR></SPAN> <SPAN 
class=ps37><NOBR>表<SPAN class=em0>3-7</SPAN>中列出了<SPAN 
class=em0>TCAP</SPAN>消息类型。<SPAN class=em0>ANSI</SPAN>文</NOBR></SPAN> <SPAN 
class=ps38><NOBR>档<SPAN class=em0>T1.114-1996</SPAN>是该协议的完全规范。</NOBR></SPAN> 
<SPAN class=ps39><NOBR><SPAN class=ft2>第<SPAN 
class=em3>3</SPAN>章&nbsp;语音电话的基本呼叫控制</SPAN></NOBR></SPAN> <SPAN 
class=ps40><NOBR><SPAN class=ft3>119</SPAN></NOBR></SPAN> <SPAN 
class=ps41><NOBR><SPAN class=ft4>文档</SPAN></NOBR></SPAN> <SPAN 
class=ps42><NOBR><SPAN class=ft5>消息</SPAN></NOBR></SPAN> <SPAN 
class=ps43><NOBR><SPAN class=ft5>事务部分</SPAN></NOBR></SPAN> <SPAN 
class=ps44><NOBR><SPAN class=ft5>TCA</SPAN></NOBR></SPAN> <SPAN 
class=ps45><NOBR><SPAN class=ft5>消息</SPAN></NOBR></SPAN> <SPAN 
class=ps46><NOBR><SPAN class=ft5>组件部分</SPAN></NOBR></SPAN> <SPAN 
class=ps47><NOBR><SPAN class=ft6>图<SPAN class=em4>3-16 
&nbsp;&nbsp;TCAP</SPAN>消息结构</SPAN></NOBR></SPAN> </BODY></HTML>

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