001_16.htm

来自「通讯类的标准。对要开发SS7的朋友有很大帮助的。（通讯协议）」· HTM 代码 · 共 386 行

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<DIV class=im6><IMG height=64 src="1_16.files/left.jpg" width=564 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>(<SPAN class=em3>续</SPAN>)</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR>代</NOBR></SPAN> <SPAN class=ps2><NOBR>码</NOBR></SPAN> <SPAN 
class=ps3><NOBR>意</NOBR></SPAN> <SPAN class=ps4><NOBR>义</NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft2>512</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR>网关没有设置为检测某种被请求的信号</NOBR></SPAN> <SPAN class=ps7><NOBR><SPAN 
class=ft2>513</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR>网关没有设置为产生某种被请求的信号</NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft2>514</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR>网关不能发送指定的广播</NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft2>515</SPAN></NOBR></SPAN> <SPAN class=ps12><NOBR>不正确的连接<SPAN 
class=em0>ID</SPAN></NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft2>516</SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR>未知的呼叫<SPAN 
class=em0>ID</SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft2>517</SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR>不支持或无效的模式</NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN 
class=ft2>518</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR>不支持或未知识的包</NOBR></SPAN> <SPAN class=ps19><NOBR><SPAN 
class=ft2>519</SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR>端点没有数字映像</NOBR></SPAN> 
<SPAN class=ps21><NOBR><SPAN class=ft2>520</SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR>端点在重启动</NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft2>521</SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR>端点被重定向到其他<SPAN 
class=em0>MGC</SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft2>522</SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR>无此类事件或信号</NOBR></SPAN> 
<SPAN class=ps27><NOBR><SPAN class=ft2>523</SPAN></NOBR></SPAN> <SPAN 
class=ps28><NOBR>不可识别的动作或非法的动作组合</NOBR></SPAN> <SPAN class=ps29><NOBR><SPAN 
class=ft2>524</SPAN></NOBR></SPAN> <SPAN class=ps30><NOBR>本地连接选项（<SPAN 
class=em0>LocalConnectionOptions</SPAN>）内部不一致</NOBR></SPAN> <SPAN 
class=ps31><NOBR><SPAN class=ft2>525</SPAN></NOBR></SPAN> <SPAN 
class=ps32><NOBR>本地连接选项中有不可识别的扩展名</NOBR></SPAN> <SPAN class=ps33><NOBR><SPAN 
class=ft2>526</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR>带宽不够</NOBR></SPAN> 
<SPAN class=ps35><NOBR><SPAN class=ft2>527</SPAN></NOBR></SPAN> <SPAN 
class=ps36><NOBR>远程连接描述符（<SPAN 
class=em0>RemoteConnectionDescriptor</SPAN>）丢失</NOBR></SPAN> <SPAN 
class=ps37><NOBR><SPAN class=ft2>528</SPAN></NOBR></SPAN> <SPAN 
class=ps38><NOBR>不兼容的协议版本</NOBR></SPAN> <SPAN class=ps39><NOBR><SPAN 
class=ft3>从这个列表中可以明显地看到，当<SPAN 
class=em1>MG</SPAN>或其环境中出现多重错误时，选择错误代码可能出</SPAN></NOBR></SPAN> <SPAN 
class=ps40><NOBR><SPAN 
class=ft3>现歧义。定义的代码看来也不支持内部的硬件问题，不过现在正在努力容纳内部错误报告。</SPAN></NOBR></SPAN> <SPAN 
class=ps41><NOBR><SPAN 
class=ft3>错误代码的主要目的在于防止协议、配置和黑盒性能错误。根据这些错误代码提供的信息对</SPAN></NOBR></SPAN> <SPAN 
class=ps42><NOBR><SPAN 
class=ft3>系统进行有意义的诊断是不可能的，系统健壮性的问题在协议的早期并不是特别重要。健壮</SPAN></NOBR></SPAN> <SPAN 
class=ps43><NOBR><SPAN 
class=ft3>性、冗余性和可诊断性的问题只是被看做一个实现细节，必须要实现其他的方法才可以从介</SPAN></NOBR></SPAN> <SPAN 
class=ps44><NOBR><SPAN class=ft3>质网关和端点上获得诊断信息。<SPAN 
class=em1>SNMP</SPAN>就是这样的一个可能方法，所以它必定可以在<SPAN 
class=em1>VoIP</SPAN>介</SPAN></NOBR></SPAN> <SPAN class=ps45><NOBR><SPAN 
class=ft3>质网关设计中找到自己的位置。</SPAN></NOBR></SPAN> <SPAN class=ps46><NOBR><SPAN 
class=ft3>表<SPAN 
class=em1>1-10</SPAN>中的推理代码是端点在单方面删除一个或多个连接时产生的。下面的情况是端点</SPAN></NOBR></SPAN> 
<SPAN class=ps47><NOBR><SPAN class=ft3>功能出错时可能产生歧义的例子。端点收到</SPAN></NOBR></SPAN> 
<SPAN class=ps48><NOBR><SPAN class=ft4>CRCX<SPAN 
class=em4>命令后对它做正确的解析，并立即发回</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps49><NOBR><SPAN class=ft4>ACK<SPAN class=em4>消息。</SPAN>MGC<SPAN 
class=em4>继续它的工作，认为命令已经执行，并尝试着连接呼叫的另一端。尝试完成</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps50><NOBR><SPAN class=ft3>连接之后，<SPAN 
class=em1>MG</SPAN>发现端点出了故障。它接着向<SPAN class=em1>MGC</SPAN>返回一个<SPAN 
class=em1>DLCX</SPAN>命令，代码是<SPAN class=em1>900</SPAN>。这样，</SPAN></NOBR></SPAN> 
<SPAN class=ps51><NOBR><SPAN class=ft4>MGC<SPAN 
class=em4>开始拆卸过程并清除部分建立的呼叫。</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps52><NOBR><SPAN 
class=ft3>避免这个例子出现的一个可能的实现是，当接收到命令后保持端点的当前状态可用，并</SPAN></NOBR></SPAN> <SPAN 
class=ps53><NOBR><SPAN class=ft3>根据该命令是否可以完成的先验只是来决定是否拒绝它。这样可以加速<SPAN 
class=em1>ACK</SPAN>或者带错误代码</SPAN></NOBR></SPAN> <SPAN class=ps54><NOBR><SPAN 
class=ft3>的<SPAN class=em1>NAK</SPAN>消息的返回，避免<SPAN 
class=em1>MGC</SPAN>的不必要的动作。当我们考虑到这种呼叫可能遍布全国时，必</SPAN></NOBR></SPAN> <SPAN 
class=ps55><NOBR><SPAN 
class=ft3>须注意：呼叫建立过程的速度对用户使用电话线路的感受是至关重要的。</SPAN></NOBR></SPAN> <SPAN 
class=ps56><NOBR><SPAN class=ft5>表<SPAN class=em5>1-10 
&nbsp;&nbsp;</SPAN>网关生成的<SPAN class=em5>DLCX</SPAN>命令的<SPAN 
class=em5>MGCP</SPAN>推理代码</SPAN></NOBR></SPAN> <SPAN 
class=ps57><NOBR>代</NOBR></SPAN> <SPAN class=ps58><NOBR>码</NOBR></SPAN> <SPAN 
class=ps59><NOBR>意</NOBR></SPAN> <SPAN class=ps60><NOBR>义</NOBR></SPAN> <SPAN 
class=ps61><NOBR><SPAN class=ft2>900</SPAN></NOBR></SPAN> <SPAN 
class=ps62><NOBR>端点发生故障</NOBR></SPAN> <SPAN class=ps63><NOBR><SPAN 
class=ft2>901</SPAN></NOBR></SPAN> <SPAN class=ps64><NOBR>端点取消服务</NOBR></SPAN> 
<SPAN class=ps65><NOBR><SPAN class=ft2>902</SPAN></NOBR></SPAN> <SPAN 
class=ps66><NOBR>低层连接丢失</NOBR></SPAN> <SPAN class=ps67><NOBR><SPAN 
class=ft6>16&nbsp;&nbsp;<SPAN class=em2>IP </SPAN><SPAN 
class=em6>电话技术：稳定的</SPAN><SPAN class=em2>VoIP</SPAN><SPAN 
class=em6>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps68><NOBR><SPAN 
class=ft7>文档</SPAN></NOBR></SPAN> </BODY></HTML>

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