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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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<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
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border=0></DIV>
<DIV class=im1><IMG height=678 src="003_26.files/003_26_2.jpg" width=555 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>第<SPAN class=em0>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>125</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=em1>3-20 
&nbsp;&nbsp;</SPAN>呼叫建立的基本<SPAN class=em1>MGCP</SPAN>信令，一个<SPAN 
class=em1>MGC</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN 
class=ft4>不管使用哪种网络技术来实现各种网络分割，同类信令层都具有显著的优势。呼叫建立</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft4>需要一个端到端协议，而不需要中间的协议转换和协作功能。一个反例是<SPAN 
class=em2>IP</SPAN>网络和电话用户</SPAN></NOBR></SPAN> <SPAN class=ps6><NOBR><SPAN 
class=ft5>POTS<SPAN class=em3>服务之间的信令，在这种情况下，在</SPAN>PSTN<SPAN 
class=em3>的入口和出口处都必须有一个额外的协作步</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR><SPAN class=ft4>骤，同时影响每秒处理呼叫和传输语音的<SPAN 
class=em2>QoS</SPAN>的性能。另一方面，一个完全同类网络的缺点</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN class=ft4>是在选择设备类型时缺乏灵活性，这将会造成经济损失。</SPAN></NOBR></SPAN> 
<SPAN class=ps9><NOBR>用户<SPAN class=em4>1</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR>检测到摘机</NOBR></SPAN> <SPAN class=ps11><NOBR>拨号音调收集</NOBR></SPAN> 
<SPAN class=ps12><NOBR>数字查找挂机</NOBR></SPAN> <SPAN 
class=ps13><NOBR>数字已被收集</NOBR></SPAN> <SPAN class=ps14><NOBR>呼叫进程</NOBR></SPAN> 
<SPAN class=ps15><NOBR>用户<SPAN class=em4>2</SPAN></NOBR></SPAN> <SPAN 
class=ps16><NOBR>振铃</NOBR></SPAN> <SPAN class=ps17><NOBR>电话摘机</NOBR></SPAN> 
<SPAN class=ps18><NOBR>端点<SPAN class=em4>1</SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR>查找摘机</NOBR></SPAN> <SPAN class=ps20><NOBR>检测到摘机</NOBR></SPAN> 
<SPAN class=ps21><NOBR>CRCX+RQNT+</NOBR></SPAN> <SPAN 
class=ps22><NOBR>信</NOBR></SPAN> <SPAN class=ps23><NOBR><SPAN 
class=ft7>号</SPAN></NOBR></SPAN> <SPAN class=ps24><NOBR>发送数字</NOBR></SPAN> <SPAN 
class=ps25><NOBR>建立连接<SPAN class=em4>FDX</SPAN></NOBR></SPAN> <SPAN 
class=ps26><NOBR>呼叫已建立</NOBR></SPAN> <SPAN 
class=ps27><NOBR>摘机，用户拿起电话</NOBR></SPAN> <SPAN 
class=ps28><NOBR>返回该端点支持的模式</NOBR></SPAN> <SPAN 
class=ps29><NOBR>播放振铃音，查找摘机</NOBR></SPAN> <SPAN 
class=ps30><NOBR>电话号码到IP</NOBR></SPAN> <SPAN 
class=ps31><NOBR>地址的转换</NOBR></SPAN> <SPAN class=ps32><NOBR>端点<SPAN 
class=em4>2</SPAN></NOBR></SPAN> <SPAN class=ps33><NOBR>介质网关控制器</NOBR></SPAN> 
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