<?xml version="1.0" encoding="utf-8"?><?xml-stylesheet href='http://feeds.feedsky.com/styles/temp01.xsl' type='text/xsl' ?><!--这是一个由Feedsy提供技术支持的Feed，为了提高读者阅读的体验，以及满足用户美化自己Feed的需要，我们设计了多种精美的Feed模板，提供给大家选择，所有最终呈现出来的样式，皆由用户自愿选择使用，未经许可，任何团体和个人，请不要擅自修改样式或者盗用，这是对于用户选择权的尊重。--><rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:fs="http://www.feedsky.com/namespace/feed" version="2.0"><channel><atom:link href="http://feeds.feedsky.com/csdn.net/linuxcumt" type="application/rss+xml" ref="self"></atom:link><lastBuildDate>Thu, 12 Apr 2007 09:49:00 GMT</lastBuildDate><title>linuxcumt的专栏</title><link>http://blog.csdn.net/linuxcumt/</link><item><title>SIP安全的分析与实现</title><link>http://item.feedsky.com/~csdn.net/linuxcumt/~1077485/22532817/1077484/1/item.html</link><wfw:comment>http://blog.csdn.net/linuxcumt/comments/1561610.aspx</wfw:comment><slash:comments>0</slash:comments><wfw:commentRss>http://blog.csdn.net/linuxcumt/comments/commentRss/1561610.aspx</wfw:commentRss><trackback:ping>http://tb.blog.csdn.net/TrackBack.aspx?PostId=1561610</trackback:ping><description>&lt;img src =&quot;http://blog.csdn.net/linuxcumt/aggbug/1561610.aspx&quot; width = &quot;1&quot; height = &quot;1&quot; /&gt;</description><pubDate>Thu, 12 Apr 2007 17:49:00 +0800</pubDate><author>linuxcumt</author><comments>http://blog.csdn.net/linuxcumt/archive/2007/04/12/1561610.aspx#Feedback</comments><guid isPermaLink="false">http://blog.csdn.net/linuxcumt/archive/2007/04/12/1561610.aspx</guid><dc:creator>linuxcumt</dc:creator><fs:srclink>http://blog.csdn.net/linuxcumt/archive/2007/04/12/1561610.aspx</fs:srclink><fs:srcfeed>http://blog.csdn.net/linuxcumt/rss.aspx</fs:srcfeed><fs:itemid>csdn.net/linuxcumt/~1077485/22532817/1077484</fs:itemid></item><item><title>SIP安全</title><link>http://item.feedsky.com/~csdn.net/linuxcumt/~1077485/22532818/1077484/1/item.html</link><wfw:comment>http://blog.csdn.net/linuxcumt/comments/1561597.aspx</wfw:comment><slash:comments>0</slash:comments><wfw:commentRss>http://blog.csdn.net/linuxcumt/comments/commentRss/1561597.aspx</wfw:commentRss><trackback:ping>http://tb.blog.csdn.net/TrackBack.aspx?PostId=1561597</trackback:ping><description>&lt;img src =&quot;http://blog.csdn.net/linuxcumt/aggbug/1561597.aspx&quot; 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width = &quot;1&quot; height = &quot;1&quot; /&gt;</description><pubDate>Wed, 11 Apr 2007 23:28:00 +0800</pubDate><author>linuxcumt</author><comments>http://blog.csdn.net/linuxcumt/archive/2007/04/11/1560642.aspx#Feedback</comments><guid isPermaLink="false">http://blog.csdn.net/linuxcumt/archive/2007/04/11/1560642.aspx</guid><dc:creator>linuxcumt</dc:creator><fs:srclink>http://blog.csdn.net/linuxcumt/archive/2007/04/11/1560642.aspx</fs:srclink><fs:srcfeed>http://blog.csdn.net/linuxcumt/rss.aspx</fs:srcfeed><fs:itemid>csdn.net/linuxcumt/~1077485/22532820/1077484</fs:itemid></item><item><title>SIP协议与视频通信</title><link>http://item.feedsky.com/~csdn.net/linuxcumt/~1077485/22532821/1077484/1/item.html</link><wfw:comment>http://blog.csdn.net/linuxcumt/comments/1560614.aspx</wfw:comment><slash:comments>0</slash:comments><wfw:commentRss>http://blog.csdn.net/linuxcumt/comments/commentRss/1560614.aspx</wfw:commentRss><trackback:ping>http://tb.blog.csdn.net/TrackBack.aspx?PostId=1560614</trackback:ping><description>SIP协议与视频通信。作为一个IETF提出的标准，SIP协议在很大程度上借鉴了其他各种广泛存在的Internet协议，如HTTP(超文本传输协议)、SMTP(简单邮件传输协议)等，和这些协议一样SIP也采用的基于文本的编码方式，这也是SIP协议同视频通讯领域其他现有标准相比最大的特点之一。按逻辑功能区分，SIP系统由4种元素组成：用户代理，SIP代理服务器，重定向服务器以及SIP注册服务器。图1 SIP呼叫建立过程。虽然SIP协议用于电信视频应用存在问题，但是随着SIP协议首先在语音交互中的应用以及软交换中的使用，可以看到SIP协议还是有较好的前景。&lt;img src =&quot;http://blog.csdn.net/linuxcumt/aggbug/1560614.aspx&quot; 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