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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=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=64 src="003_18.files/right.jpg" width=563 
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<DIV class=im1><IMG height=3 src="003_18.files/003_18_2.jpg" width=558 
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<DIV class=im6><IMG height=3 src="003_18.files/003_18_7.jpg" width=558 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>第<SPAN class=em3>3</SPAN>章&nbsp;语音电话的基本呼叫控制</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN class=ft1>117</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft2>文档</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft3>高级网络特性。包网络中引入的新的高级特性必须和<SPAN 
class=em0>PSTN</SPAN>的特性相互可操作。面对包网络应</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN 
class=ft3>用的集成问题的另一个方面是，对于公用网的操作有很多管理要求。</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft4>SCCP<SPAN class=em1>和</SPAN>TCAP<SPAN 
class=em1>交互，以支持</SPAN>LNP<SPAN class=em1>、</SPAN>800/900<SPAN 
class=em1>号码转换以及高级智能网络呼叫模型。</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft4>1. SCCP<SPAN 
class=em4>服务</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft3>如表<SPAN class=em0>3-5</SPAN>所示，<SPAN 
class=em0>SCCP</SPAN>层可以用于四类服务之一。北美电话网络使用无连接模式的<SPAN 
class=em0>SCCP</SPAN>。</SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft4>SCCP<SPAN class=em1>通过其服务可以提供到远程应用的寻址消息所需要的子系统号码（&nbsp;<SPAN 
class=em0>SubSystem Number</SPAN>，</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft4>SSN<SPAN class=em1>）</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps10><NOBR><SPAN class=ft3>。如前所述，标识远程应用所需要的另一个元件是远程节点的点码（<SPAN 
class=em0>Point Code</SPAN>，<SPAN class=em0>PC</SPAN>），它</SPAN></NOBR></SPAN> 
<SPAN class=ps11><NOBR><SPAN class=ft3>由<SPAN 
class=em0>MTP</SPAN>提供。拨打的数字的全局标题翻译（<SPAN class=em0>Global Title 
Translation</SPAN>，<SPAN class=em0>GTT</SPAN>）也通过<SPAN 
class=em0>SCCP</SPAN>实现。</SPAN></NOBR></SPAN> <SPAN class=ps12><NOBR><SPAN 
class=ft5>表<SPAN class=em5>3-5 &nbsp;SCCP</SPAN>服务类型</SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR>类</NOBR></SPAN> <SPAN class=ps14><NOBR>别</NOBR></SPAN> <SPAN 
class=ps15><NOBR>服务类型</NOBR></SPAN> <SPAN class=ps16><NOBR>备</NOBR></SPAN> <SPAN 
class=ps17><NOBR>注</NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN class=ft7>0<SPAN 
class=em6>类</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR>基本的无连接服务</NOBR></SPAN> <SPAN class=ps20><NOBR>来自<SPAN 
class=em2>SCCP</SPAN>用户的数据单元以自带寻址信息的包发送，来</NOBR></SPAN> <SPAN 
class=ps21><NOBR>自同一用户的数据单元可以不按顺序发送</NOBR></SPAN> <SPAN class=ps22><NOBR><SPAN 
class=ft7>1<SPAN class=em6>类</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR>排序的无连接服务</NOBR></SPAN> <SPAN class=ps24><NOBR>来自<SPAN 
class=em2>SCCP</SPAN>用户的数据单元按顺序发送</NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft7>2<SPAN class=em6>类</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps26><NOBR>基本的面向连接的服务</NOBR></SPAN> <SPAN class=ps27><NOBR>这种模式类似于<SPAN 
class=em2>0</SPAN>类，但是数据流需要建立连接，不提供</NOBR></SPAN> <SPAN 
class=ps28><NOBR>排序和流控制</NOBR></SPAN> <SPAN class=ps29><NOBR><SPAN 
class=ft7>3<SPAN class=em6>类</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR>面向连接的服务</NOBR></SPAN> <SPAN 
class=ps31><NOBR>这种模式建立一个连接，数据由流控制排序</NOBR></SPAN> <SPAN class=ps32><NOBR><SPAN 
class=ft4>2. SCCP<SPAN class=em4>消息和格式</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps33><NOBR><SPAN class=ft4>SCCP<SPAN class=em1>有效载荷由</SPAN>MTP<SPAN 
class=em1>消息的</SPAN>SIF<SPAN class=em1>域携带，<SPAN 
class=em0>SIO</SPAN>域被编码为表示作为服务的</SPAN>SCCP<SPAN class=em1>。</SPAN>SCCP<SPAN 
class=em1>消</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN 
class=ft3>息的产生方法和<SPAN 
class=em0>ISUP</SPAN>消息类似。每一条消息都包含一个固定的必须部分和一个可变的必须部</SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR><SPAN class=ft3>分。图<SPAN class=em0>3-15</SPAN>中是<SPAN 
class=em0>SCCP</SPAN>消息的一般格式。</SPAN></NOBR></SPAN> <SPAN class=ps36><NOBR><SPAN 
class=ft3>被叫方地址、呼叫方地址、子系统数据以及相应的长度域是<SPAN 
class=em0>SCCP</SPAN>消息的可选的可变长度</SPAN></NOBR></SPAN> <SPAN 
class=ps37><NOBR><SPAN class=ft3>部分。它们的内容由用户部分（<SPAN class=em0>TCAP</SPAN>、<SPAN 
class=em0>ISUP<SPAN class=em1>）</SPAN></SPAN>传给<SPAN class=em0>SCCP<SPAN 
class=em1>，</SPAN></SPAN>而<SPAN 
class=em0>SCCP</SPAN>路由功能决定目标点码</SPAN></NOBR></SPAN> <SPAN 
class=ps38><NOBR><SPAN class=ft3>（<SPAN class=em0>Destination Point 
Code</SPAN>，<SPAN class=em0>DPC</SPAN>）和信令链路选择（<SPAN class=em0>Signaling Link 
Selection</SPAN>，<SPAN class=em0>SLS</SPAN>）域的内容。</SPAN></NOBR></SPAN> <SPAN 
class=ps39><NOBR><SPAN class=ft4>DPC<SPAN class=em1>被插入到</SPAN>CDA<SPAN 
class=em1>域中。</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps40><NOBR><SPAN 
class=ft3>被叫方地址和呼叫方地址中包含<SPAN class=em0>SCCP</SPAN>用户的子系统号码（<SPAN 
class=em0>Subsystem Number</SPAN>，<SPAN 
class=em0>SSN</SPAN>）。</SPAN></NOBR></SPAN> <SPAN class=ps41><NOBR><SPAN 
class=ft3>表<SPAN class=em0>3-6</SPAN>中是北美网络中定义的子系统号码。</SPAN></NOBR></SPAN> <SPAN 
class=ps42><NOBR><SPAN class=ft5>表<SPAN class=em5>3-6 &nbsp;&nbsp;</SPAN>北美<SPAN 
class=em5>SCCP</SPAN>中的子系统号码</SPAN></NOBR></SPAN> <SPAN 
class=ps43><NOBR>子系统号码</NOBR></SPAN> <SPAN class=ps44><NOBR>编</NOBR></SPAN> 
<SPAN class=ps45><NOBR>码</NOBR></SPAN> <SPAN class=ps46><NOBR>未使用</NOBR></SPAN> 
<SPAN class=ps47><NOBR><SPAN class=ft7>0</SPAN></NOBR></SPAN> <SPAN 
class=ps48><NOBR><SPAN class=ft7>SCCP<SPAN 
class=em6>管理实体</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps49><NOBR><SPAN 
class=ft7>1</SPAN></NOBR></SPAN> <SPAN class=ps50><NOBR><SPAN 
class=ft7>ISUP</SPAN></NOBR></SPAN> <SPAN class=ps51><NOBR><SPAN 
class=ft7>3</SPAN></NOBR></SPAN> <SPAN class=ps52><NOBR>操作、维修、管理（<SPAN 
class=em2>Operations</SPAN>，<SPAN class=em2>Maintenance and 
Administration</SPAN>，<SPAN class=em2>OMAP</SPAN>）</NOBR></SPAN> <SPAN 
class=ps53><NOBR><SPAN class=ft7>4</SPAN></NOBR></SPAN> <SPAN 
class=ps54><NOBR>移动以部件</NOBR></SPAN> <SPAN class=ps55><NOBR><SPAN 
class=ft7>5</SPAN></NOBR></SPAN> <SPAN class=ps56><NOBR>家庭位置注册</NOBR></SPAN> 
<SPAN class=ps57><NOBR><SPAN class=ft7>6</SPAN></NOBR></SPAN> <SPAN 
class=ps58><NOBR>访问位置注册</NOBR></SPAN> <SPAN class=ps59><NOBR><SPAN 
class=ft7>7</SPAN></NOBR></SPAN> <SPAN class=ps60><NOBR>移动交换中心</NOBR></SPAN> 
<SPAN class=ps61><NOBR><SPAN class=ft7>8</SPAN></NOBR></SPAN> <SPAN 
class=ps62><NOBR>授权中心</NOBR></SPAN> <SPAN class=ps63><NOBR><SPAN 
class=ft7>10</SPAN></NOBR></SPAN> <SPAN class=ps64><NOBR><SPAN 
class=ft3>注意，<SPAN class=em0>TCAP</SPAN>本身不能被分配<SPAN 
class=em0>SSN</SPAN>。相反地，使用<SPAN 
class=em0>TCAP</SPAN>的应用服务被明确地表示，这些</SPAN></NOBR></SPAN> <SPAN 
class=ps65><NOBR><SPAN class=ft3>信息通过<SPAN class=em0>SCCP</SPAN>传送给<SPAN 
class=em0>TCAP<SPAN class=em1>，</SPAN></SPAN>以完成到应用的最终传输。</SPAN></NOBR></SPAN> 
<SPAN class=ps66><NOBR><SPAN class=ft3>为了全局标题翻译，被叫方地址可能会说明<SPAN 
class=em0>GT</SPAN>的出现。如果出现<SPAN class=em0>GT<SPAN 
class=em1>，</SPAN></SPAN>那么<SPAN class=em0>GT</SPAN>本身被包</SPAN></NOBR></SPAN> 
<SPAN class=ps67><NOBR><SPAN class=ft3>含在<SPAN class=em0>CDA</SPAN>域中。如果请求<SPAN 
class=em0>GT</SPAN>翻译，根据翻译的结果，可能也要请求路由。另一个选择是请求</SPAN></NOBR></SPAN> 
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