📄 003_33.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=im0><IMG height=64 src="003_33.files/left.jpg" width=564 
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<DIV class=im2><IMG height=500 src="003_33.files/003_33_3.jpg" width=375 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>132&nbsp;&nbsp;<SPAN class=em0>IP </SPAN><SPAN 
class=em3>电话技术：稳定的</SPAN><SPAN class=em0>VoIP</SPAN><SPAN 
class=em3>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>文档</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN class=ft2>(<SPAN 
class=em4>续</SPAN>)</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR>事务处理</NOBR></SPAN> <SPAN class=ps4><NOBR>参</NOBR></SPAN> <SPAN 
class=ps5><NOBR>数</NOBR></SPAN> <SPAN class=ps6><NOBR>注意和解释</NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft4>NTFY</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR>（从被叫端点到<SPAN class=em2>MGC<SPAN 
class=em1>）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR>（<SPAN 
class=em2>12</SPAN>）</NOBR></SPAN> <SPAN class=ps10><NOBR><SPAN 
class=ft4>RQNT</SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft4>(<SPAN class=em1>从</SPAN>MGC<SPAN 
class=em1>到被叫端点</SPAN>)</SPAN></NOBR></SPAN> <SPAN class=ps12><NOBR>（<SPAN 
class=em2>14</SPAN>）</NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft4>MDCX</SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft4>(<SPAN class=em1>从</SPAN>MGC<SPAN class=em1>到</SPAN>PSTN<SPAN 
class=em1>网关</SPAN>)</SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR>（<SPAN 
class=em2>16</SPAN>）</NOBR></SPAN> <SPAN class=ps16><NOBR><SPAN 
class=ft4>ANM</SPAN></NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN 
class=ft4>(18)</SPAN></NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft5>当任何一方挂机时，呼叫终止过程将被激活。在这个例子中，假设在呼叫<SPAN 
class=em5>VoIP</SPAN>端的一方</SPAN></NOBR></SPAN> <SPAN class=ps19><NOBR><SPAN 
class=ft5>首先挂机（被叫方）。图<SPAN 
class=em5>3-23</SPAN>中是呼叫终止操作和接下来的信令步骤的讨论。</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR><SPAN class=ft6>图<SPAN class=em6>3-22 
&nbsp;&nbsp;</SPAN>通过<SPAN class=em6>PSTN</SPAN>网关的<SPAN 
class=em6>ISUP</SPAN>到<SPAN class=em6>S/MGCP</SPAN>的呼叫建立</SPAN></NOBR></SPAN> 
<SPAN class=ps21><NOBR>消息带有显示，表明电话已被挂断，这意味着有人已接过电话。在步</NOBR></SPAN> <SPAN 
class=ps22><NOBR>骤<SPAN class=em2>13</SPAN>中<SPAN 
class=em2>MGC</SPAN>确认消息</NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft4>MGC<SPAN 
class=em1>需要使端点很敏感地去探测挂断状况（电话返回到指令连接）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR>。</NOBR></SPAN> <SPAN class=ps25><NOBR>在步骤<SPAN 
class=em2>15</SPAN>中，<SPAN class=em2>MG</SPAN>确认这个消息</NOBR></SPAN> <SPAN 
class=ps26><NOBR>通过在双方的端点和网关间建立连接，消息完成呼叫设置。在步骤<SPAN 
class=em2>17</SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR>中由网关确认此点</NOBR></SPAN> 
<SPAN class=ps28><NOBR><SPAN class=ft4>MGC<SPAN class=em1>在其主域的步骤</SPAN>16<SPAN 
class=em1>和</SPAN>17<SPAN class=em1>中一完成呼叫设置，就发送</SPAN>ISUP<SPAN 
class=em1>消息。</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps29><NOBR><SPAN 
class=ft4>OLE<SPAN class=em1>一接到消息就发送</SPAN>Q.931 CONNECT<SPAN 
class=em1>消息到呼叫发信方，而且现在认为</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR>呼叫是稳定的。而且为了填表目的地呼叫计算信息也在此时启动</NOBR></SPAN> <SPAN 
class=ps31><NOBR><SPAN class=ft4>PSTN<SPAN 
class=em1>端点</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps32><NOBR>起始本地交换机<SPAN 
class=em2>PSTN</SPAN>网关</NOBR></SPAN> <SPAN 
class=ps33><NOBR>介质网关控制器</NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN 
class=ft4>VoIP<SPAN class=em1>介质</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR>网关</NOBR></SPAN> <SPAN class=ps36><NOBR>用户</NOBR></SPAN> <SPAN 
class=ps37><NOBR>设置<SPAN class=em2>TGW</SPAN></NOBR></SPAN> <SPAN 
class=ps38><NOBR>设置<SPAN class=em2>MG</SPAN></NOBR></SPAN> <SPAN 
class=ps39><NOBR>再次查找挂机</NOBR></SPAN> <SPAN 
class=ps40><NOBR>呼叫正在进行中</NOBR></SPAN> <SPAN 
class=ps41><NOBR>呼叫已建立</NOBR></SPAN> <SPAN class=ps42><NOBR>被叫方摘机</NOBR></SPAN> 
<SPAN class=ps43><NOBR>应答</NOBR></SPAN> <SPAN class=ps44><NOBR>振铃</NOBR></SPAN> 
<SPAN class=ps45><NOBR>摘机</NOBR></SPAN> <SPAN 
class=ps46><NOBR>查找OH，</NOBR></SPAN> <SPAN class=ps47><NOBR>开始振铃</NOBR></SPAN> 
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