001_41.htm

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<BODY>
<DIV class=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=3 src="001_41.files/001_41_1.jpg" width=558 
border=0></DIV>
<DIV class=im1><IMG height=2 src="001_41.files/001_41_2.jpg" width=558 
border=0></DIV>
<DIV class=im2><IMG height=3 src="001_41.files/001_41_3.jpg" width=558 
border=0></DIV>
<DIV class=im3><IMG height=64 src="001_41.files/right.jpg" width=563 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>(<SPAN class=em3>续</SPAN>)</SPAN></NOBR></SPAN> <SPAN 
class=ps1><NOBR>Q.931/Q.932<SPAN class=em4>消息</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR>T X <SPAN class=em4>支持</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR>R X <SPAN class=em4>支持</SPAN></NOBR></SPAN> <SPAN 
class=ps4><NOBR><SPAN class=ft2>有效范围</SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR>Setup</NOBR></SPAN> <SPAN class=ps6><NOBR>M</NOBR></SPAN> <SPAN 
class=ps7><NOBR>M</NOBR></SPAN> <SPAN class=ps8><NOBR><SPAN 
class=ft2>全局</SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR>Setup 
Acknowledge</NOBR></SPAN> <SPAN class=ps10><NOBR>O</NOBR></SPAN> <SPAN 
class=ps11><NOBR>O</NOBR></SPAN> <SPAN class=ps12><NOBR><SPAN 
class=ft2>局部</SPAN></NOBR></SPAN> <SPAN 
class=ps13><NOBR>Disconnect</NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps16><NOBR>Release</NOBR></SPAN> 
<SPAN class=ps17><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR>Release Complete</NOBR></SPAN> <SPAN 
class=ps20><NOBR>M</NOBR></SPAN> <SPAN class=ps21><NOBR>M</NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft2>局部</SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR>Resume</NOBR></SPAN> <SPAN class=ps24><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps27><NOBR>Resume Acknowledge</NOBR></SPAN> <SPAN 
class=ps28><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps30><NOBR>N/A</NOBR></SPAN> <SPAN class=ps31><NOBR>Resume 
Reject</NOBR></SPAN> <SPAN class=ps32><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps33><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps35><NOBR>Suspend</NOBR></SPAN> <SPAN class=ps36><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps37><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps38><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps39><NOBR>Suspend Acknowledge</NOBR></SPAN> <SPAN 
class=ps40><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps41><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps42><NOBR>N/A</NOBR></SPAN> <SPAN class=ps43><NOBR>Suspend 
Reject</NOBR></SPAN> <SPAN class=ps44><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps45><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps46><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps47><NOBR>User Information</NOBR></SPAN> <SPAN 
class=ps48><NOBR>O</NOBR></SPAN> <SPAN class=ps49><NOBR>O</NOBR></SPAN> <SPAN 
class=ps50><NOBR><SPAN class=ft2>只有端点</SPAN></NOBR></SPAN> <SPAN 
class=ps51><NOBR>Congestion Control</NOBR></SPAN> <SPAN class=ps52><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps53><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps54><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps55><NOBR>Information</NOBR></SPAN> <SPAN 
class=ps56><NOBR>O</NOBR></SPAN> <SPAN class=ps57><NOBR>O</NOBR></SPAN> <SPAN 
class=ps58><NOBR><SPAN class=ft2>局部</SPAN></NOBR></SPAN> <SPAN 
class=ps59><NOBR>Notify</NOBR></SPAN> <SPAN class=ps60><NOBR>O</NOBR></SPAN> 
<SPAN class=ps61><NOBR>O</NOBR></SPAN> <SPAN class=ps62><NOBR><SPAN 
class=ft2>接入端点</SPAN></NOBR></SPAN> <SPAN class=ps63><NOBR>Status</NOBR></SPAN> 
<SPAN class=ps64><NOBR>M</NOBR></SPAN> <SPAN class=ps65><NOBR>M</NOBR></SPAN> 
<SPAN class=ps66><NOBR><SPAN class=ft2>局部</SPAN></NOBR></SPAN> <SPAN 
class=ps67><NOBR>Status Inquiry</NOBR></SPAN> <SPAN 
class=ps68><NOBR>O</NOBR></SPAN> <SPAN class=ps69><NOBR>M</NOBR></SPAN> <SPAN 
class=ps70><NOBR><SPAN class=ft2>局部</SPAN></NOBR></SPAN> <SPAN 
class=ps71><NOBR>Facility</NOBR></SPAN> <SPAN class=ps72><NOBR>M</NOBR></SPAN> 
<SPAN class=ps73><NOBR>M</NOBR></SPAN> <SPAN class=ps74><NOBR><SPAN 
class=ft2>局部</SPAN></NOBR></SPAN> <SPAN class=ps75><NOBR>Hold</NOBR></SPAN> 
<SPAN class=ps76><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps77><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps78><NOBR>N/A</NOBR></SPAN> <SPAN class=ps79><NOBR>Hold 
Acknowledge</NOBR></SPAN> <SPAN class=ps80><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps81><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps82><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps83><NOBR>Hold Reject</NOBR></SPAN> <SPAN class=ps84><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps85><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps86><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps87><NOBR>Retrieve</NOBR></SPAN> <SPAN class=ps88><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps89><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps90><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps91><NOBR>Retrive Acknowledge</NOBR></SPAN> <SPAN 
class=ps92><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps93><NOBR><SPAN class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN 
class=ps94><NOBR>N/A</NOBR></SPAN> <SPAN class=ps95><NOBR>Retrieve 
Reject</NOBR></SPAN> <SPAN class=ps96><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps97><NOBR><SPAN 
class=ft2>不允许</SPAN></NOBR></SPAN> <SPAN class=ps98><NOBR>N/A</NOBR></SPAN> 
<SPAN class=ps99><NOBR><SPAN class=ft3>注：<SPAN class=em0>O=</SPAN>可选的，<SPAN 
class=em0>M=</SPAN>必须的</SPAN></NOBR></SPAN> <SPAN class=ps100><NOBR><SPAN 
class=ft4>13. RAS<SPAN class=em5>协议</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps101><NOBR><SPAN class=ft5>我们已经在呼叫流中看到了<SPAN class=em2>RAS<SPAN 
class=em1>（</SPAN>Registration</SPAN>、<SPAN class=em2>Admission and Status<SPAN 
class=em1>，</SPAN></SPAN>注册、接受和状态）</SPAN></NOBR></SPAN> <SPAN 
class=ps102><NOBR><SPAN class=ft5>协议的一些功能。<SPAN 
class=em2>RAS</SPAN>是一个直接的协议，端点用它来向关守注册，以和<SPAN 
class=em2>H.323</SPAN>端点建立呼叫。</SPAN></NOBR></SPAN> <SPAN class=ps103><NOBR><SPAN 
class=ft4>RAS<SPAN class=em1>提供了</SPAN>H.225.0<SPAN 
class=em1>信令性能中遗漏的功能。</SPAN>H.225.0<SPAN class=em1>使用的是</SPAN>Q.931<SPAN 
class=em1>消息的子集，它们来</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps104><NOBR><SPAN 
class=ft5>自<SPAN class=em2>TDM 
PSTN</SPAN>那样的网络，像用户识别和认证、终端性能、别名命名、动态带宽需求和管理</SPAN></NOBR></SPAN> <SPAN 
class=ps105><NOBR><SPAN class=ft5>功能这些服务不可能通过<SPAN 
class=em2>H.225.0</SPAN>呼叫信令来实现。<SPAN class=em2>RAS</SPAN>填补了<SPAN 
class=em2>H.225.0</SPAN>呼叫信令和<SPAN class=em2>H.323</SPAN>中的</SPAN></NOBR></SPAN> 
<SPAN class=ps106><NOBR><SPAN class=ft4>H.245<SPAN 
class=em1>逻辑信道控制之间的性能真空。作为比较，&nbsp;<SPAN 
class=em2>SIP</SPAN>信令协议提供了</SPAN>RAS<SPAN 
class=em1>类型的能力，并作</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps107><NOBR><SPAN 
class=ft5>为协议规范的整体部分。</SPAN></NOBR></SPAN> <SPAN class=ps108><NOBR><SPAN 
class=ft5>许多<SPAN 
class=em2>RAS</SPAN>事务包括与关守之间来回行程的信息交换。记住，每个网络中并不一定要存在</SPAN></NOBR></SPAN> 
<SPAN class=ps109><NOBR><SPAN 
class=ft5>一个关守。但是，如果存在一个关守，所有的端点需要使用它的服务。</SPAN></NOBR></SPAN> <SPAN 
class=ps110><NOBR><SPAN class=ft4>GK<SPAN 
class=em1>为端点提供呼叫</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps111><NOBR><SPAN 
class=ft5>管理信令（代理信令），或者端点之间简单的呼叫信令路由。如前所述，当一条<SPAN 
class=em2>ARQ</SPAN>消息从</SPAN></NOBR></SPAN> <SPAN class=ps112><NOBR><SPAN 
class=ft5>端点发送到<SPAN 
class=em2>GK</SPAN>时，呼叫模式已被选定。注意，一个端点并不一定要是物理端点。终端、服</SPAN></NOBR></SPAN> <SPAN 
class=ps113><NOBR><SPAN class=ft5>务器和网关对关守而言代表着多个端点，每一个都通过该关守的区域内的<SPAN 
class=em2>RAS</SPAN>协议过程来建</SPAN></NOBR></SPAN> <SPAN class=ps114><NOBR><SPAN 
class=ft5>立呼叫。对于网络中的<SPAN 
class=em2>GK</SPAN>和其他信令实体而言，服务于多个用户的计算机终端可以表示多</SPAN></NOBR></SPAN> <SPAN 
class=ps115><NOBR><SPAN class=ft5>个端点。</SPAN></NOBR></SPAN> <SPAN 
class=ps116><NOBR><SPAN class=ft4>RAS<SPAN class=em1>定义的基本服务为</SPAN>GK<SPAN 
class=em1>所在区域内的地址转换、接受控制、带宽请求和管理功能。表</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps117><NOBR><SPAN class=ft4>1-12<SPAN class=em1>中是</SPAN>RAS<SPAN 
class=em1>消息的注释集。</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps118><NOBR><SPAN 
class=ft6>第<SPAN class=em6>1</SPAN>章<SPAN 
class=em6>IP</SPAN>语音和交互应用的协议</SPAN></NOBR></SPAN> <SPAN class=ps119><NOBR><SPAN 
class=ft7>41</SPAN></NOBR></SPAN> <SPAN class=ps120><NOBR><SPAN 
class=ft8>文档</SPAN></NOBR></SPAN> </BODY></HTML>
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