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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=64 src="003_35.files/left.jpg" width=564 
border=0></DIV>
<DIV class=im1><IMG height=402 src="003_35.files/003_35_2.jpg" width=535 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>134&nbsp;&nbsp;<SPAN class=em0>IP </SPAN><SPAN 
class=em4>电话技术：稳定的</SPAN><SPAN class=em0>VoIP</SPAN><SPAN 
class=em4>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>文档</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR>信息码到发起端点。</NOBR></SPAN> 
<SPAN class=ps3><NOBR><SPAN class=ft3>图<SPAN class=em5>3-24 
&nbsp;&nbsp;SIP</SPAN>到<SPAN class=em5>S/MGCP</SPAN>的简单呼叫建立</SPAN></NOBR></SPAN> 
<SPAN class=ps4><NOBR>一旦被叫方拿起电话、<SPAN class=em2>MGC</SPAN>接收到<SPAN 
class=em2>NTFY<SPAN class=em1>，</SPAN></SPAN>则会发送成功编码（编码<SPAN class=em2>200<SPAN 
class=em1>）</SPAN></SPAN>到<SPAN class=em2>SIP</SPAN>端点。</NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft4>SIP ACK <SPAN 
class=em1>完成呼叫建立，介质将开始在端点之间流动。呼叫已经建立！</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR>这是个简单的例子，但是它说明了建立呼叫时所使用的消息类型。对于公用网上的</NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft4>VoIP</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR>电话，还要考虑其他很多因素，它们必须在呼叫建立中得到解释。当然，其中之一就是端点</NOBR></SPAN> <SPAN 
class=ps9><NOBR>间可能的介质类型协商。<SPAN class=em2>SIP ACK </SPAN>消息会携带<SPAN 
class=em2>SIP</SPAN>端点可接受的<SPAN class=em2>SDP&nbsp;<SPAN 
class=em1>，</SPAN></SPAN>这个信息会被传给</NOBR></SPAN> <SPAN class=ps10><NOBR><SPAN 
class=ft4>MGC<SPAN class=em1>，</SPAN><SPAN class=em1>以对被叫端点的</SPAN>SDP<SPAN 
class=em1>做可能的修改。</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps11><NOBR>其他的一些设计考虑涉及收费和用户授权。它们和其他面向服务的性能的实现依赖于平</NOBR></SPAN> <SPAN 
class=ps12><NOBR>台设计，在不同的系统中会发生变化。不管远程端点的性质如何，如果<SPAN class=em2>SIP</SPAN>到<SPAN 
class=em2>S/MGCP</SPAN>的信令</NOBR></SPAN> <SPAN class=ps13><NOBR>涉及<SPAN 
class=em2>PSTN</SPAN>中继，那么这些功能都将很重要。<SPAN class=em2>SIP 
INVITE</SPAN>消息可以简单地映射为<SPAN class=em2>ISUP IAM<SPAN 
class=em1>，</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR>这样可以产生快速的后向“<SPAN 
class=em2>trying</SPAN>”<SPAN class=em2>SIP</SPAN>消息。<SPAN 
class=em2>ACM</SPAN>表明远程电话正在振铃，<SPAN class=em2>MGC</SPAN>向<SPAN 
class=em2>SIP</SPAN>端点</NOBR></SPAN> <SPAN class=ps15><NOBR>生成“<SPAN 
class=em2>ringing</SPAN>”。当被叫方接听电话、<SPAN class=em2>MGC</SPAN>收到<SPAN 
class=em2>ANM</SPAN>时，它会向<SPAN class=em2>SIP</SPAN>端点报告“<SPAN class=em2>success 
200</SPAN>”。</NOBR></SPAN> <SPAN class=ps16><NOBR>来自端点的<SPAN 
class=em2>ACK</SPAN>将初始化介质路径，这样彼此就可以听到对方的声音。</NOBR></SPAN> <SPAN 
class=ps17><NOBR>集成服务<SPAN 
class=em2>MGC</SPAN>的设计者面临着大量的实现细节，呼叫路径各段的连续性测试就是其中一</NOBR></SPAN> <SPAN 
class=ps18><NOBR>个。</NOBR></SPAN> <SPAN class=ps19><NOBR><SPAN class=ft4>2. 
H.323<SPAN class=em6>和</SPAN>S/MGCP<SPAN class=em6>端点之间通过</SPAN>PSTN<SPAN 
class=em6>的呼叫建立</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps20><NOBR>在第<SPAN 
class=em2>1</SPAN>章中讨论了一种<SPAN class=em2>H.323</SPAN>和<SPAN 
class=em2>S/MGCP</SPAN>端点的混合拓扑，它不包含<SPAN 
class=em2>PSTN</SPAN>中继器。如果两</NOBR></SPAN> <SPAN 
class=ps21><NOBR>种类型的用户之间存在包网络连通性，而不经过<SPAN 
class=em2>PSTN</SPAN>网络，那么事情相对来说要简单一些。</NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft5>SIP<SPAN 
class=em3>端点</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft6>集成<SPAN class=em7>MGC</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft6>介质网关</SPAN></NOBR></SPAN> <SPAN 
class=ps25><NOBR><SPAN class=ft6>用户</SPAN></NOBR></SPAN> <SPAN 
class=ps26><NOBR><SPAN class=ft6>发送<SPAN class=em7>SDP<SPAN 
class=em3>，</SPAN></SPAN>建立<SPAN class=em7>fdx</SPAN>连接</SPAN></NOBR></SPAN> 
<SPAN class=ps27><NOBR><SPAN class=ft6>查找OH开始振铃</SPAN></NOBR></SPAN> <SPAN 
class=ps28><NOBR><SPAN class=ft6>呼叫被接受</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft6>这是第一条好消息</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR><SPAN class=ft6>来自用户，试图建立呼叫</SPAN></NOBR></SPAN> <SPAN 
class=ps31><NOBR><SPAN class=ft5>Trying(<SPAN 
class=em3>编码</SPAN>100)</SPAN></NOBR></SPAN> <SPAN class=ps32><NOBR><SPAN 
class=ft5>Trying(<SPAN class=em3>编码</SPAN>180)</SPAN></NOBR></SPAN> <SPAN 
class=ps33><NOBR><SPAN class=ft5>Success(<SPAN 
class=em3>编码</SPAN>200)</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN 
class=ft6>当再次挂机时通知用户</SPAN></NOBR></SPAN> <SPAN class=ps35><NOBR><SPAN 
class=ft6>这是SIP ACK，确认INVITE的成功</SPAN></NOBR></SPAN> <SPAN 
class=ps36><NOBR><SPAN class=ft6>我们已经进入通话期。</SPAN></NOBR></SPAN> <SPAN 
class=ps37><NOBR><SPAN class=ft5>(<SPAN class=em3>假定</SPAN>SIP<SPAN 
class=em3>和</SPAN>MGCP<SPAN class=em3>端点之间的</SPAN>SDP<SPAN 
class=em3>兼容性</SPAN>)</SPAN></NOBR></SPAN> <SPAN class=ps38><NOBR><SPAN 
class=ft6>用户定位服务可以</SPAN></NOBR></SPAN> <SPAN class=ps39><NOBR><SPAN 
class=ft6>在这里实现</SPAN></NOBR></SPAN> <SPAN class=ps40><NOBR><SPAN 
class=ft6>振铃</SPAN></NOBR></SPAN> <SPAN class=ps41><NOBR><SPAN 
class=ft6>摘机</SPAN></NOBR></SPAN> </BODY></HTML>

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