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📄 001_29.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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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0059)http://www.chinagk.org/technology/IPTech/001/css/001_29.htm -->
<HTML><HEAD><TITLE>001_29</TITLE>
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<BODY>
<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=64 src="001_29.files/right.jpg" width=563 
border=0></DIV>
<DIV class=im1><IMG height=572 src="001_29.files/001_29_2.jpg" width=552 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR>册。拒绝的原因可能与<SPAN 
class=em0>GK</SPAN>内部资源的可用程度相关，但不应该经常发生。假定<SPAN 
class=em0>GK</SPAN>已经接受</NOBR></SPAN> <SPAN class=ps1><NOBR>了注册，接收终端会发送一条<SPAN 
class=em0>RAS </SPAN>接受请求（<SPAN class=em0>Admission Request</SPAN>，<SPAN 
class=em0>ARQ</SPAN>）到<SPAN class=em0>GK<SPAN 
class=em1>，</SPAN></SPAN>请求进入</NOBR></SPAN> <SPAN 
class=ps2><NOBR>网络、为呼叫分配带宽以及信令模型，或者直接或者通过<SPAN class=em0>GK</SPAN>路由。<SPAN 
class=em0>UDP</SPAN>端口<SPAN class=em0>1719</SPAN>是<SPAN 
class=em0>RAS</SPAN>传输</NOBR></SPAN> <SPAN class=ps3><NOBR>地址。<SPAN 
class=em0>GK</SPAN>可能不同意该请求，在它应答的接受确认（<SPAN class=em0>Admission 
Confirmed</SPAN>，<SPAN class=em0>ACF</SPAN>）消息中可</NOBR></SPAN> <SPAN 
class=ps4><NOBR>能返回不同的呼叫模型。<SPAN 
class=em0>GK</SPAN>也可能因各种原因拒绝该请求，如无法获得带宽，这时将返回接</NOBR></SPAN> <SPAN 
class=ps5><NOBR>受拒绝（<SPAN class=em0>Admission Rejected</SPAN>，<SPAN 
class=em0>ARJ</SPAN>）。如果<SPAN class=em0>GK</SPAN>并不允许该请求，终端会用<SPAN 
class=em0>H.225.0</SPAN>消息</NOBR></SPAN> <SPAN class=ps6><NOBR><SPAN 
class=ft1>RELEASE COMPLETE<SPAN class=em1>释放该呼叫。在这个例子中，<SPAN 
class=em0>GK</SPAN>批准了该请求，被叫端发送</SPAN>H.225.0</SPAN></NOBR></SPAN> <SPAN 
class=ps7><NOBR>消息<SPAN class=em0>ALERTING<SPAN 
class=em1>，</SPAN></SPAN>指示呼叫端正在震铃。<SPAN 
class=em0>ALERTING</SPAN>消息指示了用于拨号后延迟计算的标志。</NOBR></SPAN> <SPAN 
class=ps8><NOBR>在实际的分布式拓扑中，图<SPAN class=em0>1-12</SPAN>所示的消息交换，从打开<SPAN 
class=em0>TCP</SPAN>连接开始，到<SPAN class=em0>ALERTING</SPAN>消息，</NOBR></SPAN> <SPAN 
class=ps9><NOBR>可以节省几秒钟量级的时间。最后，当被叫方接受该呼叫时<SPAN 
class=em0>CONNECT</SPAN>消息被发送。该消息</NOBR></SPAN> <SPAN 
class=ps10><NOBR>携带一个十分重要的数值，即用于初始化<SPAN 
class=em0>H.245</SPAN>信令建立介质通道的动态端口号。</NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft2>图<SPAN class=em2>1-15 &nbsp;&nbsp;H.245</SPAN>端点容量集（<SPAN 
class=em2>1</SPAN>）</SPAN></NOBR></SPAN> <SPAN class=ps12><NOBR><SPAN 
class=ft3>第<SPAN class=em3>1</SPAN>章<SPAN 
class=em3>IP</SPAN>语音和交互应用的协议</SPAN></NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft4>29</SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft5>文档</SPAN></NOBR></SPAN> </BODY></HTML>

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