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<DIV class=im12><IMG height=64 src="001_50.files/left.jpg" width=564
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR>编</NOBR></SPAN>
<SPAN class=ps1><NOBR>码</NOBR></SPAN> <SPAN class=ps2><NOBR>意</NOBR></SPAN>
<SPAN class=ps3><NOBR>义</NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN
class=ft1>100</SPAN></NOBR></SPAN> <SPAN class=ps5><NOBR>正在尝试—和<SPAN
class=em1>Q.931 CALL PROCEEDING</SPAN>类似,可能会被代理服务器、或者呼叫</NOBR></SPAN> <SPAN
class=ps6><NOBR>信令路径上的其他中间<SPAN class=em1>SIP</SPAN>服务器返回</NOBR></SPAN> <SPAN
class=ps7><NOBR><SPAN class=ft1>180</SPAN></NOBR></SPAN> <SPAN
class=ps8><NOBR>正在振铃—和<SPAN class=em1>Q.931
ALERTING</SPAN>类似。表示虚拟或者真实的电话正在振铃</NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN
class=ft1>181</SPAN></NOBR></SPAN> <SPAN
class=ps10><NOBR>呼叫转发—如果一个代理服务器返回这个编码,那么可能表示它正在转发消息体</NOBR></SPAN> <SPAN
class=ps11><NOBR>中的呼叫</NOBR></SPAN> <SPAN class=ps12><NOBR><SPAN
class=ft1>182</SPAN></NOBR></SPAN> <SPAN
class=ps13><NOBR>排队等待服务—它对于某些应用有用,可以延迟呼叫回答,直到它们处理完队列</NOBR></SPAN> <SPAN
class=ps14><NOBR>中排在它前面的呼叫为止。大公司的用户服务部门是这个特性的主要用户</NOBR></SPAN> <SPAN
class=ps15><NOBR><SPAN class=ft2>2)</SPAN></NOBR></SPAN> <SPAN
class=ps16><NOBR><SPAN class=ft3>成功(编码<SPAN class=em3>200<SPAN
class=em0>)</SPAN></SPAN>。被叫方成功解析和执行了请求。</SPAN></NOBR></SPAN> <SPAN
class=ps17><NOBR>编</NOBR></SPAN> <SPAN class=ps18><NOBR>码</NOBR></SPAN> <SPAN
class=ps19><NOBR>意</NOBR></SPAN> <SPAN class=ps20><NOBR>义</NOBR></SPAN> <SPAN
class=ps21><NOBR><SPAN class=ft1>200</SPAN></NOBR></SPAN> <SPAN
class=ps22><NOBR>请求成功执行(<SPAN class=em1>OK</SPAN>)。这和<SPAN class=em1>S/MGCP
ACK</SPAN>的<SPAN class=em1>OK</SPAN>不同(不要把它们混淆)</NOBR></SPAN> <SPAN
class=ps23><NOBR><SPAN class=ft2>3) <SPAN class=em0>重定向(编码</SPAN>300~399<SPAN
class=em0>)</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR><SPAN
class=ft3>。呼叫在可以完成之前需要进一步的处理。所定义的编码是:</SPAN></NOBR></SPAN> <SPAN
class=ps25><NOBR>编</NOBR></SPAN> <SPAN class=ps26><NOBR>码</NOBR></SPAN> <SPAN
class=ps27><NOBR>意</NOBR></SPAN> <SPAN class=ps28><NOBR>义</NOBR></SPAN> <SPAN
class=ps29><NOBR><SPAN class=ft1>300</SPAN></NOBR></SPAN> <SPAN
class=ps30><NOBR>在对请求中的地址进行解析时出现多个选择。它们会被返回,呼叫者可以从列表中挑</NOBR></SPAN> <SPAN
class=ps31><NOBR>出一个来重定向呼叫。这就是出现“歧义”的同义词,但是有歧义的名称解析会导致它</NOBR></SPAN> <SPAN
class=ps32><NOBR>自身的错误编码</NOBR></SPAN> <SPAN class=ps33><NOBR><SPAN
class=ft1>301</SPAN></NOBR></SPAN> <SPAN
class=ps34><NOBR>被叫用户已经永久地搬走了,呼叫方应该尝试应答报头(<SPAN
class=em1>Contact</SPAN>:域)中返回的新</NOBR></SPAN> <SPAN
class=ps35><NOBR>位置。呼叫方可能得到一个所有可能位置的列表,他可以选择一个顺序,然后按照这个</NOBR></SPAN> <SPAN
class=ps36><NOBR>顺序扫过列表,完成呼叫。如果服务器在它的存储信息中找不到任何关于被叫方的信息,</NOBR></SPAN> <SPAN
class=ps37><NOBR>它将返回一个<SPAN class=em1>NOT FOUND</SPAN>错误编码</NOBR></SPAN> <SPAN
class=ps38><NOBR><SPAN class=ft1>302</SPAN></NOBR></SPAN> <SPAN
class=ps39><NOBR>被叫用户暂时离开,可以在返回的地址中找到。这对于人工呼叫转发有用,因为服务</NOBR></SPAN> <SPAN
class=ps40><NOBR>器不能转发这个呼叫</NOBR></SPAN> <SPAN class=ps41><NOBR><SPAN
class=ft1>305</SPAN></NOBR></SPAN> <SPAN
class=ps42><NOBR>被叫用户不能直接访问,呼叫必须由代理服务器处理。只有呼叫代理才能够发送这个</NOBR></SPAN> <SPAN
class=ps43><NOBR>应答</NOBR></SPAN> <SPAN class=ps44><NOBR><SPAN
class=ft1>380</SPAN></NOBR></SPAN> <SPAN
class=ps45><NOBR>得不到请求的服务,但是可能得到其他的服务。这是一条不可靠的消息。<SPAN
class=em1>SDP</SPAN>参数不</NOBR></SPAN> <SPAN
class=ps46><NOBR>匹配由另一种编码表示</NOBR></SPAN> <SPAN class=ps47><NOBR><SPAN
class=ft2>4) <SPAN class=em0>客户请求失败(编码</SPAN>400~499<SPAN
class=em0>)</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps48><NOBR><SPAN
class=ft3>。服务器不能解析该请求或者该请求不能执行。在再次</SPAN></NOBR></SPAN> <SPAN
class=ps49><NOBR><SPAN class=ft3>尝试之前必须修改该请求。</SPAN></NOBR></SPAN> <SPAN
class=ps50><NOBR>编</NOBR></SPAN> <SPAN class=ps51><NOBR>码</NOBR></SPAN> <SPAN
class=ps52><NOBR>意</NOBR></SPAN> <SPAN class=ps53><NOBR>义</NOBR></SPAN> <SPAN
class=ps54><NOBR><SPAN class=ft1>400</SPAN></NOBR></SPAN> <SPAN
class=ps55><NOBR>由于语法错误造成的错误请求。这意味着远程端点无法解析消息体。任何语法错误都</NOBR></SPAN> <SPAN
class=ps56><NOBR>应该返回这个编码。系统行为和实现有关</NOBR></SPAN> <SPAN class=ps57><NOBR><SPAN
class=ft1>401</SPAN></NOBR></SPAN> <SPAN
class=ps58><NOBR>在进行这项请求之前,用户需要授权。当收到这一错误编码时,消息格式化使用特殊</NOBR></SPAN> <SPAN
class=ps59><NOBR>的规则(例如,没有<SPAN class=em1>SIP</SPAN>压缩消息格式)</NOBR></SPAN> <SPAN
class=ps60><NOBR><SPAN class=ft1>402</SPAN></NOBR></SPAN> <SPAN
class=ps61><NOBR>用户欠款。(将来应用。)对电话公司而言是好的特性。没有规定操作,但可以猜测</NOBR></SPAN> <SPAN
class=ps62><NOBR><SPAN class=ft1>403</SPAN></NOBR></SPAN> <SPAN
class=ps63><NOBR>禁止请求——不要再次尝试。消息已经被分列,但请求无法兑现。如果你试图拨打一</NOBR></SPAN> <SPAN
class=ps64><NOBR>个号码,而该号码不接受来自你的号码的呼叫,你会得到这条消息</NOBR></SPAN> <SPAN
class=ps65><NOBR><SPAN class=ft1>404</SPAN></NOBR></SPAN> <SPAN
class=ps66><NOBR>找不到用户。当用户从来不存在时,或者还没有从服务器中清除记录时,会发送这条</NOBR></SPAN> <SPAN
class=ps67><NOBR>消息</NOBR></SPAN> <SPAN class=ps68><NOBR><SPAN
class=ft1>405</SPAN></NOBR></SPAN> <SPAN
class=ps69><NOBR>被叫用户不允许消息中的编码方法。允许所有的编码方法是一个不错的主意,但这是</NOBR></SPAN> <SPAN
class=ps70><NOBR>实现决定</NOBR></SPAN> <SPAN class=ps71><NOBR><SPAN
class=ft1>406</SPAN></NOBR></SPAN> <SPAN
class=ps72><NOBR>被叫用户会产生呼叫者不能理解的反应(编码难以接受)。如果呼叫过程继续,这种</NOBR></SPAN> <SPAN
class=ps73><NOBR>反应可以避免端点之间建立空中楼阁</NOBR></SPAN> <SPAN class=ps74><NOBR><SPAN
class=ft1>407</SPAN></NOBR></SPAN> <SPAN
class=ps75><NOBR>在行进之前,首先用户代理授权</NOBR></SPAN> <SPAN class=ps76><NOBR><SPAN
class=ft4>50 <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=ps77><NOBR><SPAN
class=ft5>文档</SPAN></NOBR></SPAN> </BODY></HTML>
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