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用vb编的一个拨号电话软件程序，希望对visual basic编程感兴趣和希望了解拨号电话软件程序原理的人有所帮助-Vb by telephone for a dial-up software programs, hoping to interest in visual basic programming and would like to know the principle of a dial-up phone software programs help people! !

利用h.323进行语音呼叫的程序-use H.323 voice calls for the procedure

SIP_ISUP，SIP ISUP互联互通协议部分，对于学习NGN软交换之间的协议流程很有帮助。-SIP_ISUP, SIP ISUP protocol interoperability of NGN Softswitch to study the agreement between the flow of great help.

H.323的PWLib代码-H.323 PWLib code

HELIX　的filesystem.rar部分-verified our part of the filesystem.rar

视频压缩编解码ITU h.263源代码.经典的视频会议和远程监控算法.- The video frequency compression arranges decodes ITU the h.263 source code Classical video frequency conference and long-distance monitoring algorithm

跨平台（Linux，Windows）的开源SIP服务器端-Cross-platform (Linux, Windows) open-source SIP server-side

目前网络上面sip协议比较流行,现在这个是一个sip协议的测试软件,可以对当前的sip软件进行版本兼容性测试.-above the current network sip agreement more popular, and now this agreement is a sip of testing software that the current version sip software compatibility testing.

使用directshow来进行mpeg-4的视频传输，网络传输使用rtp协议-directshow to use MPEG-4 video transmission, the use of network transmission agreement rtp

RTP实现代码，用C++语言实现，源代码-RTP code, using C++ language, source code