📄 003_36.htm

📁 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=im1><IMG height=579 src="003_36.files/003_36_2.jpg" width=467 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>第<SPAN class=em2>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>135</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft2>文档</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR><SPAN class=ft3>图<SPAN class=em0>3-25</SPAN>和图<SPAN 
class=em0>3-26</SPAN>中呼叫流说明了通过<SPAN class=em0>ISUP</SPAN>上<SPAN 
class=em0>S/MGCP</SPAN>和<SPAN class=em0>SS7</SPAN>网络，<SPAN class=em0>H.323 
PSTN</SPAN>网关和<SPAN class=em0>RGW</SPAN>网</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft3>关之间的交互。</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft4>图<SPAN class=em3>3-25 
&nbsp;&nbsp;PSTN</SPAN>上<SPAN class=em3>S/MGCP</SPAN>到<SPAN 
class=em3>H.323</SPAN>的呼叫建立</SPAN></NOBR></SPAN> <SPAN class=ps6><NOBR><SPAN 
class=ft3>在这个例子中，<SPAN class=em0>S/MGCP</SPAN>介质网关上的端点发起呼叫。</SPAN></NOBR></SPAN> 
<SPAN class=ps7><NOBR><SPAN class=ft3>直到（包括）第<SPAN 
class=em0>8</SPAN>步之前，信令流一直是基本的<SPAN class=em0>S/MGCP</SPAN>呼叫建立。<SPAN 
class=em0>MGC</SPAN>寻找摘机通知，</SPAN></NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft3>一旦获得这个通知，它将查找一个有效的数字串并请求端点播放拨号音。数字映射可以是以</SPAN></NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft3>前就存在的，也可以是在第<SPAN class=em0>5</SPAN>步中用<SPAN 
class=em0>RQNT</SPAN>指令文档的，一旦搜集到这些数字，<SPAN 
class=em0>MGC</SPAN>会判断被</SPAN></NOBR></SPAN> <SPAN class=ps10><NOBR><SPAN 
class=ft3>叫方跨越<SPAN class=em0>PSTN<SPAN class=em1>，</SPAN></SPAN>需要和它自己的<SPAN 
class=em0>PSTN</SPAN>网关建立呼叫。这个过程从发送<SPAN 
class=em0>CRCX</SPAN>到网关、请求在</SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft5>SS7<SPAN class=em1>网络上发送一个</SPAN>IAM<SPAN class=em1>（</SPAN>ISUP<SPAN 
class=em1>）</SPAN><SPAN 
class=em1>消息开始。网关会抢占出口电路并初始化信令，在它自己</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps12><NOBR><SPAN class=ft3>和终止交换机之间建立一个跨越中间所有交换中继段的<SPAN 
class=em0>TDM</SPAN>网路。</SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR>呼叫方</NOBR></SPAN> <SPAN class=ps14><NOBR>介质网</NOBR></SPAN> 
<SPAN class=ps15><NOBR>关端点</NOBR></SPAN> <SPAN 
class=ps16><NOBR>集成介质网关</NOBR></SPAN> <SPAN class=ps17><NOBR>控制器</NOBR></SPAN> 
<SPAN class=ps18><NOBR><SPAN class=ft7>H.323<SPAN 
class=em4>关守</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR>被叫方</NOBR></SPAN> <SPAN 
class=ps20><NOBR>开始H.225.0信令</NOBR></SPAN> <SPAN 
class=ps21><NOBR>建立连接</NOBR></SPAN> <SPAN class=ps22><NOBR>查找挂机</NOBR></SPAN> 
<SPAN class=ps23><NOBR>检测到摘机</NOBR></SPAN> <SPAN 
class=ps24><NOBR>查找摘机</NOBR></SPAN> <SPAN class=ps25><NOBR>接受请求</NOBR></SPAN> 
<SPAN class=ps26><NOBR>呼叫已建立</NOBR></SPAN> <SPAN 
class=ps27><NOBR>回铃</NOBR></SPAN> <SPAN class=ps28><NOBR>拨号音调</NOBR></SPAN> 
<SPAN class=ps29><NOBR>摘机</NOBR></SPAN> </BODY></HTML>
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