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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="1_15.files/001_15_1.jpg" width=558 
border=0></DIV>
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<DIV class=im3><IMG height=64 src="1_15.files/right.jpg" width=563 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN class=ft0>6. 
<SPAN class=em2>数字映像</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR>数字映像是<SPAN class=em0>ASCII</SPAN>文本字符串。要在数字收集中有效地使用<SPAN 
class=em0>MGC</SPAN>的消息，则必须在<SPAN class=em0>MG</SPAN>中</NOBR></SPAN> <SPAN 
class=ps2><NOBR>加载它。数字映像的目的是使端点在与<SPAN 
class=em0>MGC</SPAN>交换消息之前，可以判断是否拨出了一个正确的</NOBR></SPAN> <SPAN 
class=ps3><NOBR>数字序列。在<SPAN 
class=em0>POTS</SPAN>服务中，本地交换机分析客户在键盘上拨出的每个数字，如果检测到客户</NOBR></SPAN> <SPAN 
class=ps4><NOBR>拨出了一串有效的数字，那么呼叫处理开始。但是，在基于<SPAN class=em0>IP</SPAN>的信令环境中，<SPAN 
class=em0>MGC</SPAN>和<SPAN class=em0>MG</SPAN>之</NOBR></SPAN> <SPAN 
class=ps5><NOBR>间交换的消息数字非常重要。在后面将会看到，在数字输入、分析并被<SPAN 
class=em0>MG</SPAN>认定为用户拨叫了</NOBR></SPAN> <SPAN 
class=ps6><NOBR>一个有效字符串之后，需要几个消息才可以开始呼叫处理。</NOBR></SPAN> <SPAN 
class=ps7><NOBR>下面是个数字映像，<SPAN class=em0>T</SPAN>表示允许数字超时：</NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN 
class=ft0>D:([2-9]XXXXXX|703XXXXXXX|*|101XXXX|[01][2-9]XXXXXXXXX|0T</SPAN></NOBR></SPAN> 
<SPAN class=ps9><NOBR><SPAN 
class=ft0>|00|[4679]11|01X.[T#])</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR>与上面的数字映像匹配的例子是北美系统。数字映像的语法的例子如下：</NOBR></SPAN> <SPAN 
class=ps11><NOBR><SPAN class=ft0>&#8226; [2-9]XXXXXX<SPAN class=em1>—</SPAN><SPAN 
class=em1>一个普通的</SPAN>7<SPAN class=em1>位数字代表本地呼叫</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps12><NOBR><SPAN class=ft0>&#8226; 703XXXXXXX<SPAN class=em1>—</SPAN><SPAN 
class=em1>一个</SPAN>10<SPAN class=em1>位本地号码</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR><SPAN class=ft0><SUP>&#8226; </SUP>*<SUP>XX<SPAN 
class=em1>—</SPAN></SUP></SPAN></NOBR></SPAN> <SPAN 
class=ps14><NOBR>请求某类特性（如，</NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft0>*<SUP>72</SUP></SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR>请求呼叫转发）</NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN class=ft0>&#8226; 
101XXXX<SPAN class=em1>—</SPAN><SPAN 
class=em1>临时呼叫，选择您使用的载波</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft0>&#8226; [01][29]XXXXXXXXX<SPAN class=em1>—</SPAN><SPAN 
class=em1>长途呼叫（直拨或通过电话卡）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft0>&#8226; 0T<SPAN class=em1>—</SPAN><SPAN 
class=em1>呼叫操作人员</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR><SPAN 
class=ft0>&#8226; 00<SPAN class=em1>—</SPAN><SPAN 
class=em1>呼叫长途操作人员</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps21><NOBR><SPAN 
class=ft0>&#8226; [4679]11<SPAN class=em1>—</SPAN>411<SPAN class=em1>、</SPAN>611<SPAN 
class=em1>、</SPAN>711<SPAN class=em1>、</SPAN>911<SPAN 
class=em1>呼叫（北美系统）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps22><NOBR>如果<SPAN 
class=em0>MGC</SPAN>在这个层次上要对它服务的成千上万个端点做数字分析，很显然会出现双重的</NOBR></SPAN> <SPAN 
class=ps23><NOBR>问题。首先，<SPAN class=em0>MGC</SPAN>和<SPAN 
class=em0>MG</SPAN>之间的消息数可能压倒它们之间的窄带链路。从而影响<SPAN 
class=em0>MG</SPAN>可以服务</NOBR></SPAN> <SPAN class=ps24><NOBR>的端点数。其次，<SPAN 
class=em0>MGC</SPAN>内计算的需求使得用一个平台支持一个可接受规模的服务人群变得很</NOBR></SPAN> <SPAN 
class=ps25><NOBR>不经济。</NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN class=ft0>7. 
<SPAN class=em2>带错误代码的应答</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps27><NOBR><SPAN class=ft0>S/MGCP<SPAN 
class=em1>定义了当介质网关内部或周围产生出错条件时，返回给</SPAN>MGC<SPAN 
class=em1>的错误代码。每个</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps28><NOBR>事务只报告一个错误代码，当存在多个错误条件时，返回给<SPAN 
class=em0>MGC</SPAN>的错误代码的选择方法存在</NOBR></SPAN> <SPAN 
class=ps29><NOBR>歧义。也就是说，该规范中没有错误优先级。建议服务供应商采用其他方法获得<SPAN 
class=em0>MG</SPAN>服务的特</NOBR></SPAN> <SPAN 
class=ps30><NOBR>定端点的介质网关的状态的正确信息。</NOBR></SPAN> <SPAN class=ps31><NOBR>表<SPAN 
class=em0>1-9</SPAN>中是端点可以返回的应答代码的列表。</NOBR></SPAN> <SPAN class=ps32><NOBR><SPAN 
class=ft2>表<SPAN class=em3>1-9 &nbsp;MGCP</SPAN>错误代码</SPAN></NOBR></SPAN> <SPAN 
class=ps33><NOBR><SPAN class=ft3>代</SPAN></NOBR></SPAN> <SPAN 
class=ps34><NOBR><SPAN class=ft3>码</SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR><SPAN class=ft3>意</SPAN></NOBR></SPAN> <SPAN 
class=ps36><NOBR><SPAN class=ft3>义</SPAN></NOBR></SPAN> <SPAN 
class=ps37><NOBR><SPAN class=ft4>200</SPAN></NOBR></SPAN> <SPAN 
class=ps38><NOBR><SPAN class=ft3>请求的事务已被正确执行</SPAN></NOBR></SPAN> <SPAN 
class=ps39><NOBR><SPAN class=ft4>250</SPAN></NOBR></SPAN> <SPAN 
class=ps40><NOBR><SPAN class=ft3>连接被删除</SPAN></NOBR></SPAN> <SPAN 
class=ps41><NOBR><SPAN class=ft4>400</SPAN></NOBR></SPAN> <SPAN 
class=ps42><NOBR><SPAN class=ft3>瞬时错误——事务没有执行</SPAN></NOBR></SPAN> <SPAN 
class=ps43><NOBR><SPAN class=ft4>401</SPAN></NOBR></SPAN> <SPAN 
class=ps44><NOBR><SPAN class=ft3>电话已经摘机</SPAN></NOBR></SPAN> <SPAN 
class=ps45><NOBR><SPAN class=ft4>402</SPAN></NOBR></SPAN> <SPAN 
class=ps46><NOBR><SPAN class=ft3>电话已经挂机</SPAN></NOBR></SPAN> <SPAN 
class=ps47><NOBR><SPAN class=ft4>500</SPAN></NOBR></SPAN> <SPAN 
class=ps48><NOBR><SPAN class=ft3>未知的端点</SPAN></NOBR></SPAN> <SPAN 
class=ps49><NOBR><SPAN class=ft4>501</SPAN></NOBR></SPAN> <SPAN 
class=ps50><NOBR><SPAN class=ft3>端点没有就绪</SPAN></NOBR></SPAN> <SPAN 
class=ps51><NOBR><SPAN class=ft4>510</SPAN></NOBR></SPAN> <SPAN 
class=ps52><NOBR><SPAN class=ft3>协议错误</SPAN></NOBR></SPAN> <SPAN 
class=ps53><NOBR><SPAN class=ft4>511</SPAN></NOBR></SPAN> <SPAN 
class=ps54><NOBR><SPAN class=ft3>命令包含不能识别的扩展名</SPAN></NOBR></SPAN> <SPAN 
class=ps55><NOBR><SPAN class=ft5>第<SPAN class=em4>1</SPAN>章<SPAN 
class=em4>IP</SPAN>语音和交互应用的协议</SPAN></NOBR></SPAN> <SPAN class=ps56><NOBR><SPAN 
class=ft6>15</SPAN></NOBR></SPAN> <SPAN class=ps57><NOBR><SPAN 
class=ft7>文档</SPAN></NOBR></SPAN> </BODY></HTML>

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