001_27.htm

来自「通讯类的标准。对要开发SS7的朋友有很大帮助的。（通讯协议）」· HTM 代码 · 共 379 行
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<DIV class=im1><IMG height=64 src="001_27.files/right.jpg" width=563 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR><SPAN 
class=ft0>1<SPAN class=em0>）</SPAN><SPAN class=em0>呼叫初始化（阶段</SPAN>A<SPAN 
class=em0>）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps1><NOBR><SPAN 
class=ft1>。</SPAN></NOBR></SPAN> <SPAN class=ps2><NOBR><SPAN class=ft0>2<SPAN 
class=em0>）</SPAN><SPAN class=em0>端点间的初始通信和端点容量交换（阶段</SPAN>B<SPAN 
class=em0>）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps3><NOBR><SPAN 
class=ft1>。</SPAN></NOBR></SPAN> <SPAN class=ps4><NOBR><SPAN class=ft0>3<SPAN 
class=em0>）</SPAN><SPAN class=em0>建立端点之间的音频</SPAN><SPAN class=em6>/</SPAN><SPAN 
class=em0>视频通信（阶段</SPAN>C<SPAN class=em0>）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps5><NOBR><SPAN class=ft1>。</SPAN></NOBR></SPAN> <SPAN 
class=ps6><NOBR><SPAN class=ft0>4<SPAN class=em0>）</SPAN><SPAN 
class=em0>呼叫服务请求和协商（阶段</SPAN>D<SPAN class=em0>）</SPAN></SPAN></NOBR></SPAN> 
<SPAN class=ps7><NOBR><SPAN class=ft1>。</SPAN></NOBR></SPAN> <SPAN 
class=ps8><NOBR><SPAN class=ft0>5<SPAN class=em0>）</SPAN><SPAN 
class=em0>呼叫中止（阶段</SPAN>E<SPAN class=em0>）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps9><NOBR><SPAN class=ft1>。</SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR><SPAN class=ft1>图<SPAN class=em1>1-12</SPAN>、图<SPAN 
class=em1>1-13</SPAN>、图<SPAN class=em1>1-14</SPAN>中的信令图捕获了直接路由模型呼叫的<SPAN 
class=em1>5</SPAN>个阶段。这是来自一个</SPAN></NOBR></SPAN> <SPAN class=ps11><NOBR><SPAN 
class=ft1>区域的点对点呼叫的简单方案，该区域位于由<SPAN class=em1>GK</SPAN>控制的专用<SPAN 
class=em1>IP</SPAN>网络中，其<SPAN class=em1>IP</SPAN>地址为<SPAN 
class=em1>10.0.0.1</SPAN>。</SPAN></NOBR></SPAN> <SPAN class=ps12><NOBR><SPAN 
class=ft1>呼叫者<SPAN class=em1>A</SPAN>位于<SPAN class=em1>IP</SPAN>网络地址<SPAN 
class=em1>10.0.0.10<SPAN class=em0>，</SPAN></SPAN>希望呼叫用户<SPAN class=em1>B<SPAN 
class=em0>，</SPAN>B</SPAN>和<SPAN class=em1>A</SPAN>位于同一个区域中，&nbsp;<SPAN 
class=em1>IP</SPAN>地址为</SPAN></NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft0>10.0.0.12<SPAN class=em0>。呼叫者</SPAN>A<SPAN 
class=em0>或者直接知道</SPAN>B<SPAN class=em0>的</SPAN>IP<SPAN 
class=em0>网络地址，或者在呼叫信令开始之前，通过</SPAN>DNS<SPAN 
class=em0>查询、</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft1>解析得到。<SPAN class=em1>DNS</SPAN>查询通常是对信令协议透明的。</SPAN></NOBR></SPAN> 
<SPAN class=ps15><NOBR><SPAN class=ft2>第<SPAN class=em7>1</SPAN>章<SPAN 
class=em7>IP</SPAN>语音和交互应用的协议</SPAN></NOBR></SPAN> <SPAN class=ps16><NOBR><SPAN 
class=ft3>27</SPAN></NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN class=ft4>图<SPAN 
class=em8>1-13 &nbsp;&nbsp;H.323</SPAN>呼叫建立，阶段<SPAN class=em8>B</SPAN>、<SPAN 
class=em8>C</SPAN>和<SPAN class=em8>D</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps18><NOBR>呼叫方<SPAN class=em4>A IP</SPAN>地址</NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft6>10.0.0.10</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR>起始<SPAN class=em4>TCP</SPAN>端口</NOBR></SPAN> <SPAN 
class=ps21><NOBR>被叫方<SPAN class=em4>B IP</SPAN>地址</NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft6>10.0.0.12</SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR>为呼叫信令打开可靠的<SPAN class=em4>TCP</SPAN>信道</NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft6>H.245<SPAN 
class=em2>终端容量集（被叫方）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft6>H.245<SPAN class=em2>终端容量集</SPAN>ACK<SPAN class=em2>（</SPAN><SPAN 
class=em2>呼叫方）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN 
class=ft6>H.245<SPAN class=em2>终端容量集</SPAN>ACK<SPAN class=em2>（</SPAN><SPAN 
class=em2>被叫方）</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft6>H.245<SPAN class=em2>终端容量集（呼叫方）</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps28><NOBR>主/从判定A=主</NOBR></SPAN> <SPAN class=ps29><NOBR>B=从</NOBR></SPAN> 
<SPAN class=ps30><NOBR>数据类型、多路复用参数</NOBR></SPAN> <SPAN 
class=ps31><NOBR>数据类型、多路复用参数</NOBR></SPAN> <SPAN class=ps32><NOBR><SPAN 
class=ft6>H.245<SPAN class=em2>打开逻辑信道</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps33><NOBR><SPAN class=ft6>H.245<SPAN 
class=em2>打开逻辑信道</SPAN>ACK</SPAN></NOBR></SPAN> <SPAN class=ps34><NOBR><SPAN 
class=ft6>H.245<SPAN class=em2>打开逻辑信道</SPAN>ACK</SPAN></NOBR></SPAN> <SPAN 
class=ps35><NOBR><SPAN class=ft6>H.245<SPAN 
class=em2>打开逻辑信道</SPAN>ACK</SPAN></NOBR></SPAN> <SPAN class=ps36><NOBR><SPAN 
class=ft6>H.245<SPAN class=em2>打开逻辑信道</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps37><NOBR>在<SPAN class=em4>UDP</SPAN>端口<SPAN class=em4>P<SPAN 
class=em5><SUB>RTP-O</SUB></SPAN></SPAN>上</NOBR></SPAN> <SPAN 
class=ps38><NOBR>主/从判定请求</NOBR></SPAN> <SPAN class=ps39><NOBR><SPAN 
class=ft7>关守</SPAN></NOBR></SPAN> <SPAN class=ps40><NOBR>到<SPAN 
class=em4>UDP</SPAN>端口</NOBR></SPAN> <SPAN class=ps41><NOBR>阶段<SPAN 
class=em4>D<SPAN class=em2>：</SPAN>H.323</SPAN></NOBR></SPAN> <SPAN 
class=ps42><NOBR>呼叫服务</NOBR></SPAN> <SPAN class=ps43><NOBR>阶段<SPAN 
class=em4>C<SPAN class=em2>：</SPAN>H.323</SPAN></NOBR></SPAN> <SPAN 
class=ps44><NOBR>音频<SPAN class=em4>/</SPAN>视频通信</NOBR></SPAN> <SPAN 
class=ps45><NOBR>的建立</NOBR></SPAN> <SPAN class=ps46><NOBR><SPAN class=ft7>在<SPAN 
class=em4>UDP</SPAN>端口<SPAN class=em4>P</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps47><NOBR><SPAN class=ft8>RTP-O</SPAN></NOBR></SPAN> <SPAN 
class=ps48><NOBR><SPAN class=ft6>To UDP<SPAN 
class=em2>端口</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps49><NOBR><SPAN 
class=ft7>在<SPAN class=em4>UDP</SPAN>端口<SPAN class=em4>P<SPAN 
class=em3>RTP-T</SPAN></SPAN>上</SPAN></NOBR></SPAN> <SPAN class=ps50><NOBR><SPAN 
class=ft6>H.245<SPAN class=em2>关闭逻辑信道</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps51><NOBR>需要更大的带宽</NOBR></SPAN> <SPAN class=ps52><NOBR><SPAN 
class=ft6>RTP<SPAN class=em2>上的介质流，使用打开逻辑信道命令打开的</SPAN>UDP<SPAN 
class=em2>端口</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps53><NOBR><SPAN 
class=ft7>可选的额外带宽请求，</SPAN></NOBR></SPAN> <SPAN class=ps54><NOBR><SPAN 
class=ft7>如果需要的话可以使</SPAN></NOBR></SPAN> <SPAN class=ps55><NOBR><SPAN 
class=ft7>用。任何时候端点希</SPAN></NOBR></SPAN> <SPAN class=ps56><NOBR><SPAN 
class=ft7>望调整其呼叫带宽时，</SPAN></NOBR></SPAN> <SPAN class=ps57><NOBR><SPAN 
class=ft7>BCR/BCF-BRJ都可</SPAN></NOBR></SPAN> <SPAN class=ps58><NOBR><SPAN 
class=ft7>以出现。</SPAN></NOBR></SPAN> <SPAN class=ps59><NOBR>终止<SPAN 
class=em4>TCP</SPAN>端口</NOBR></SPAN> <SPAN class=ps60><NOBR>阶段<SPAN 
class=em4>B<SPAN class=em2>：</SPAN>H.323</SPAN>初始通</NOBR></SPAN> <SPAN 
class=ps61><NOBR>信和容量交换</NOBR></SPAN> <SPAN class=ps62><NOBR><SPAN 
class=ft6>A</SPAN></NOBR></SPAN> <SPAN class=ps63><NOBR><SPAN 
class=ft9>终端类型</SPAN></NOBR></SPAN> <SPAN class=ps64><NOBR>&gt;<SPAN 
class=em4>B</SPAN></NOBR></SPAN> <SPAN class=ps65><NOBR><SPAN 
class=ft9>终端类型</SPAN></NOBR></SPAN> <SPAN class=ps66><NOBR><SPAN 
class=ft10>文档</SPAN></NOBR></SPAN> </BODY></HTML>
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