📄 003_23.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=im1><IMG height=412 src="003_23.files/003_23_2.jpg" width=485 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>速实现时非常重要，传统的<SPAN 
class=em0>5</SPAN>类交换机的单片集成电路结构已经经过数十年的设计和应用，因</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN 
class=ft0>此，即使要提供一个简单的新设备，也要建立一个难以接收的高成本和大延时的结构。供应</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft0>商已经实验过专用结构，如基于<SPAN 
class=em0>CORBA</SPAN>的分布式计算和服务创建环境，但是<SPAN 
class=em0>AIN</SPAN>基本呼叫模</SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft0>型似乎还是更好的服务创建方式，在<SPAN class=em0>PSTN</SPAN>和基于包的电话中都是这样。<SPAN 
class=em0>AIN</SPAN>依赖于<SPAN class=em0>SS7</SPAN>的功</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft0>能，而<SPAN 
class=em0>TCAP</SPAN>是高级智能基本呼叫模型实现的基础。</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft1>AIN<SPAN 
class=em1>基本呼叫模型很简单，有两个半呼叫模型组成：起始模型和终止模型。呼叫过程被分</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps6><NOBR><SPAN class=ft0>成几个阶段，每个阶段都被标识和指定为呼叫中的一个点（&nbsp;<SPAN 
class=em0>point in call</SPAN>，<SPAN 
class=em0>PIC</SPAN>）。它可以简单</SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft0>地被看做呼叫生命期中的一个状态。对于所有或部分<SPAN class=em0>PIC<SPAN 
class=em1>，</SPAN>SSP</SPAN>可能查询<SPAN 
class=em0>SCP</SPAN>或其他实现电话</SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft0>特性的设备，以接收如何处理这个阶段的呼叫的指令。基本呼叫模型查询使用<SPAN 
class=em0>SS7/TCAP</SPAN>发送</SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft0>消息，<SPAN class=em0>SSP</SPAN>查询和提供应答的设备有效地推动<SPAN 
class=em0>SSP</SPAN>通过呼叫处理的各阶段，这样就可以允许</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft1>SSP<SPAN 
class=em1>不关心所提供服务的类型。图</SPAN>3-18<SPAN class=em1>和图</SPAN>3-19<SPAN 
class=em1>中是一个</SPAN>AIN<SPAN 
class=em1>的起始和终止端点的联合简化呼</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN 
class=ft0>叫模型。有两种类型的事件可以导致呼叫处理被挂起，它们分别是触发器和被请求事件。每</SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft0>一种类型的事件都有相应的检测点（<SPAN class=em0>Detection 
Point</SPAN>，<SPAN class=em0>DP</SPAN>）。触发器在单线或多线基础上提供，</SPAN></NOBR></SPAN> 
<SPAN class=ps13><NOBR><SPAN class=ft1>SSP<SPAN class=em1>中的触发器检测点（<SPAN 
class=em0>Trigger Detection Point</SPAN>，<SPAN 
class=em0>TDP</SPAN>）可以挂起呼叫处理。另一方面，在处</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR><SPAN class=ft0>理呼叫时也会遇到事件检测点（<SPAN class=em0>Event Detection 
Point</SPAN>，<SPAN class=em0>EDP</SPAN>）。如果一个<SPAN 
class=em0>PIC</SPAN>状态已经指定了</SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft0>一个检测点，而<SPAN class=em0>SSP</SPAN>希望由<SPAN 
class=em0>SCP</SPAN>推动前进，那么状态转换就会产生通过<SPAN 
class=em0>SCP</SPAN>或其他设备的一条</SPAN></NOBR></SPAN> <SPAN class=ps16><NOBR><SPAN 
class=ft0>支路，以得到附加信息。</SPAN></NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN 
class=ft2>图<SPAN class=em3>3-19 &nbsp;&nbsp;</SPAN>简化的<SPAN 
class=em3>AIN</SPAN>基本呼叫模型（终止端点）</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR><SPAN class=ft3>122&nbsp;&nbsp;<SPAN class=em2>IP </SPAN><SPAN 
class=em4>电话技术：稳定的</SPAN><SPAN class=em2>VoIP</SPAN><SPAN 
class=em4>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps19><NOBR><SPAN 
class=ft4>文档</SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR>空闲</NOBR></SPAN> <SPAN 
class=ps21><NOBR>呼叫终止端尝试进入</NOBR></SPAN> <SPAN 
class=ps22><NOBR>为呼叫终止端授权</NOBR></SPAN> <SPAN 
class=ps23><NOBR>呼叫被提出</NOBR></SPAN> <SPAN class=ps24><NOBR>呼叫尝试</NOBR></SPAN> 
<SPAN class=ps25><NOBR>被拒绝</NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN 
class=ft6>T/E</SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR>没有设备</NOBR></SPAN> 
<SPAN class=ps28><NOBR>可用</NOBR></SPAN> <SPAN 
class=ps29><NOBR>不能完成呼叫</NOBR></SPAN> <SPAN class=ps30><NOBR>呼叫被拒绝</NOBR></SPAN> 
<SPAN class=ps31><NOBR>设备选择</NOBR></SPAN> <SPAN 
class=ps32><NOBR>设备可用</NOBR></SPAN> <SPAN class=ps33><NOBR>提出呼叫</NOBR></SPAN> 
<SPAN class=ps34><NOBR>报警(电话振铃)</NOBR></SPAN> <SPAN class=ps35><NOBR><SPAN 
class=ft6>E</SPAN></NOBR></SPAN> <SPAN class=ps36><NOBR>放弃呼叫或断开</NOBR></SPAN> 
<SPAN class=ps37><NOBR>连接如呼叫者恢</NOBR></SPAN> <SPAN 
class=ps38><NOBR>复挂机状态</NOBR></SPAN> <SPAN class=ps39><NOBR>进入通话期</NOBR></SPAN> 
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