📄 001_30.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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<HTML><HEAD><TITLE>001_2_30</TITLE>
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<DIV class=im1><IMG height=547 src="001_30.files/001_2_30_2.jpg" width=558 
border=0></DIV><!-- text starts here --><SPAN class=ps0><NOBR>阶段<SPAN 
class=em2>B</SPAN>是终端之间的初始通信和容量交换。这时，再次需要在呼叫方和</NOBR></SPAN> <SPAN 
class=ps1><NOBR><SPAN class=ft1>H . 2 2 5 . 0</SPAN></NOBR></SPAN> <SPAN 
class=ps2><NOBR><SPAN class=ft1>CONNECT<SPAN class=em3>消息中提供的被叫方的</SPAN>TCP<SPAN 
class=em3>传输地址之间建立新的</SPAN>TCP<SPAN 
class=em3>连接。在两个端点之间需要</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR>建立主／从关系。主机用来解决所出现的任何和通信所需资源有关的冲突，或者任何其他次</NOBR></SPAN> <SPAN 
class=ps4><NOBR>要类型的冲突。在呼叫期间，具有最高端点类型的端点被确定作为主机。端点包含的容量越</NOBR></SPAN> <SPAN 
class=ps5><NOBR>大，它在<SPAN class=em2>H.323</SPAN>协议中的数值就越高。能够为音频、视频和传真发送信令的<SPAN 
class=em2>GK</SPAN>、<SPAN class=em2>GW</SPAN>和<SPAN 
class=em2>MCU</SPAN></NOBR></SPAN> <SPAN class=ps6><NOBR>的数值是最高的，而没有<SPAN 
class=em2>MC</SPAN>能力的端点是最低的。</NOBR></SPAN> <SPAN 
class=ps7><NOBR>主从判决消息可以作为端点容量集在同一个<SPAN 
class=em2>TCP</SPAN>有效载荷中发送。在本章的后面有更多</NOBR></SPAN> <SPAN class=ps8><NOBR>的<SPAN 
class=em2>H.323</SPAN>消息格式。呼叫流程图显示了两个端点容量集消息，每一个都来源于发起端和终止端。</NOBR></SPAN> <SPAN 
class=ps9><NOBR>每一个都被对方确认，在交换的最后，每个端点的容量都已知道，而任何不兼容性都可以由</NOBR></SPAN> <SPAN 
class=ps10><NOBR>应用来处理。我们来看一看图<SPAN class=em2>1-15</SPAN>、图<SPAN 
class=em2>1-16</SPAN>、图<SPAN class=em2>1-17</SPAN>和图<SPAN 
class=em2>1-18</SPAN>中主从复合包中包含的信息类型。</NOBR></SPAN> <SPAN 
class=ps11><NOBR>为了清晰起见，链路层和<SPAN class=em2>IP</SPAN>报头信息已经被忽略掉，该数据是用<SPAN 
class=em2>HP</SPAN>因特网监视器在实时跟踪</NOBR></SPAN> <SPAN 
class=ps12><NOBR>中捕获的。</NOBR></SPAN> <SPAN class=ps13><NOBR><SPAN 
class=ft2>图<SPAN class=em0>1-16 &nbsp;&nbsp;H.245</SPAN>端点容量集（<SPAN 
class=em0>2</SPAN>）</SPAN></NOBR></SPAN> <SPAN class=ps14><NOBR><SPAN 
class=ft3>30&nbsp;&nbsp;<SPAN class=em1>IP </SPAN><SPAN 
class=em4>电话技术：稳定的</SPAN><SPAN class=em1>VoIP</SPAN><SPAN 
class=em4>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps15><NOBR><SPAN 
class=ft4>文档</SPAN></NOBR></SPAN> </BODY></HTML>
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