📄 003_4.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=627 src="003_4.files/003_4_2.jpg" width=559 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>第<SPAN class=em1>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>103</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=em2>3-2 
&nbsp;&nbsp;SS7</SPAN>网络拓扑</SPAN></NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN 
class=ft4>STP<SPAN class=em3>通过</SPAN>A-link<SPAN class=em3>与服务控制点（<SPAN 
class=em0>Service Control Point</SPAN>，<SPAN 
class=em0>SCP</SPAN>）以及可能的多个本地交换机</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR>连接。</NOBR></SPAN> <SPAN 
class=ps6><NOBR>完成一个简单电话呼叫必须有哪些基本信令步骤？当用户拨号以后，本地交换机（&nbsp;<SPAN 
class=em0>OLE</SPAN>）</NOBR></SPAN> <SPAN 
class=ps7><NOBR>必须找到被叫号码所在地。从呼叫者看，那就是终端交换机（<SPAN class=em0>TE</SPAN>）。如果<SPAN 
class=em0>TE</SPAN>和<SPAN class=em0>LE</SPAN>不同（例如，</NOBR></SPAN> <SPAN 
class=ps8><NOBR>一个长话或由别的交换机服务的本地电话），<SPAN 
class=em0>SSP</SPAN>标识将被用来将呼叫连接到相邻交换机上的</NOBR></SPAN> <SPAN 
class=ps9><NOBR>语音干线。它然后要给相邻的交换机发信号，通知要在该干线上进行呼叫，并使用<SPAN 
class=em0>SS7</SPAN>协议通</NOBR></SPAN> <SPAN class=ps10><NOBR>过本地<SPAN 
class=em0>STP</SPAN>发出一个信号。这条消息从<SPAN class=em0>B-link</SPAN>或<SPAN 
class=em0>D-link</SPAN>送到相邻的<SPAN class=em0>STP</SPAN>。如果相邻的本地交换</NOBR></SPAN> 
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