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📁 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=pg></DIV><!-- bitmap and vector images are written here -->
<DIV class=im0><IMG height=64 src="001_44.files/left.jpg" width=564 
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<DIV class=im1><IMG height=468 src="001_44.files/001_2_44_2.jpg" width=539 
border=0></DIV><!-- text starts here --><SPAN 
class=ps0><NOBR>中提供电话特性是电话公司事务的主要部分。<SPAN 
class=em2>SIP</SPAN>的另外一个重要特性是支持用户移动性。移</NOBR></SPAN> <SPAN 
class=ps1><NOBR>动性的一个宽松定义是用户能够从任何终端和位置使用他们预定的性能，并且当用户从一个</NOBR></SPAN> <SPAN 
class=ps2><NOBR>位置移动到另一个位置时，网络能够识别和认证用户。这一概念并不是全新的，并且在<SPAN 
class=em2>H.323</SPAN></NOBR></SPAN> <SPAN 
class=ps3><NOBR>中得到很大程度上的支持。移动电话用户已经享受这种（昂贵的）漫游特性好些年了，而且</NOBR></SPAN> <SPAN 
class=ps4><NOBR>现在看起来，有动力使之成为下一代<SPAN 
class=em2>VoIP</SPAN>网络吸引人的主要因素。为了识别和认证，这种类</NOBR></SPAN> <SPAN 
class=ps5><NOBR>型的操作需要服务节点进行某种远程用户登录。在本节中，将以使用基本呼叫模型的例子来</NOBR></SPAN> <SPAN 
class=ps6><NOBR>分析<SPAN class=em2>SIP<SPAN 
class=em0>，</SPAN></SPAN>并提供和其他可用的主要竞争者的解释和比较。首先将讨论协议的一些基本原理。</NOBR></SPAN> 
<SPAN class=ps7><NOBR><SPAN class=ft1>图<SPAN class=em3>1-26 
&nbsp;&nbsp;</SPAN>使用<SPAN class=em3>SIP</SPAN>呼叫信令的两个域</SPAN></NOBR></SPAN> 
<SPAN class=ps8><NOBR><SPAN class=ft2>1. SIP<SPAN 
class=em4>系统元件和特性</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps9><NOBR><SPAN 
class=ft2>SIP<SPAN class=em0>系统包括</SPAN>UA<SPAN class=em0>（</SPAN>User 
Agents<SPAN class=em0>，</SPAN><SPAN class=em0>用户代理）以及一个或多个服务器。</SPAN>SIP<SPAN 
class=em0>系统既可以是专</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps10><NOBR>用网段、通过公用因特网连接的网段，也可以是支持其他<SPAN 
class=em2>IP</SPAN>信令协议的企业网中设备的逻辑</NOBR></SPAN> <SPAN 
class=ps11><NOBR>分组。例如，在<SPAN class=em2>LAN</SPAN>网段上运行<SPAN 
class=em2>SIP</SPAN>客户和服务器，同时容纳<SPAN class=em2>H.323</SPAN>和<SPAN 
class=em2>/</SPAN>或<SPAN class=em2>S/MGCP</SPAN>端点，这并</NOBR></SPAN> <SPAN 
class=ps12><NOBR>非是不可想象的。当然，除非在网络中的某处能够提供协议协作，否则一种呼叫信令协议的</NOBR></SPAN> <SPAN 
class=ps13><NOBR>端点用户不能呼叫其他类型的用户。这是新环境中集成服务器提供的一个特性，但由于几个</NOBR></SPAN> <SPAN 
class=ps14><NOBR>因素，这种技术还没有成熟。一个因素是<SPAN 
class=em2>H.323</SPAN>应用的成功和渗透。另一个因素就是公用网的</NOBR></SPAN> <SPAN 
class=ps15><NOBR>基本电话服务的目标是改进的基于文本的协议。在一个由相同载波提供的电话服务中，不可</NOBR></SPAN> <SPAN 
class=ps16><NOBR><SPAN class=ft3>44&nbsp;&nbsp;<SPAN class=em1>IP </SPAN><SPAN 
class=em5>电话技术：稳定的</SPAN><SPAN class=em1>VoIP</SPAN><SPAN 
class=em5>服务集成</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps17><NOBR><SPAN 
class=ft4>文档</SPAN></NOBR></SPAN> <SPAN class=ps18><NOBR><SPAN 
class=ft5>SIP<SPAN class=em6>服务器</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps19><NOBR><SPAN class=ft5>dfix.com</SPAN></NOBR></SPAN> <SPAN 
class=ps20><NOBR><SPAN class=ft6>路由器</SPAN></NOBR></SPAN> <SPAN 
class=ps21><NOBR><SPAN class=ft6>到其他网络</SPAN></NOBR></SPAN> <SPAN 
class=ps22><NOBR><SPAN class=ft6>路由</SPAN></NOBR></SPAN> <SPAN 
class=ps23><NOBR><SPAN class=ft6>路由器</SPAN></NOBR></SPAN> <SPAN 
class=ps24><NOBR><SPAN class=ft5>SIP<SPAN 
class=em6>服务器</SPAN></SPAN></NOBR></SPAN> <SPAN class=ps25><NOBR><SPAN 
class=ft5>remotesysname.com</SPAN></NOBR></SPAN> <SPAN class=ps26><NOBR><SPAN 
class=ft6>局域网</SPAN></NOBR></SPAN> <SPAN class=ps27><NOBR><SPAN 
class=ft5>SIP<SPAN class=em6>用户</SPAN></SPAN></NOBR></SPAN> <SPAN 
class=ps28><NOBR><SPAN class=ft6>局域网</SPAN></NOBR></SPAN> <SPAN 
class=ps29><NOBR><SPAN class=ft6>网关<SPAN 
class=em7>(GW)</SPAN></SPAN></NOBR></SPAN> </BODY></HTML>

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