很好的h323库，开放源代码，有开发指南-good library, open source, development guidelines

KPhone is a SIP (Session Initiation Protocol) user agent for Linux, with which you can initiate VoIP (Voice over IP) connections over the Internet. KPhone requires KDE (K Desktop Environment) or at least various libraries from the KDE package. KPhone also requires the OpenSSL libraries to be present in the system. KPhone has been somewhat tested on Red Hat 7.2 and 7.3, Slackware 8.0, SuSE 8.1 and Debian. Requirements on each distribution vary according to the installation layout.

本程序自带反向回传语音代理服务，可以使两个不同局域网内的客户机通过国际互连网进行语音通讯，本程序使用点对点方式，不通过任何中介服务器速度快，语音延迟极小，声音清晰逼真，其效果和真实IP电话不相上下，程序界面简洁，操作简单，是在互连网上打IP电话的极好工具，唯一的要求是通话双方都要有电脑，并连入互连网。 本程序能实现以下连网操作功能： 1.通话双方是同一局域网内的用户 2.通话双方是不同局域网内的用户，并通过各自的网关连入互连网 3.通话双方一个直接连入互连网，另一个处在局域网中，并通过网关连入互连网 4.通话双方直接连入互连网 一般的语音聊天软件只能实现1，4两种连网功能，而本程序能完全支持所有这四种连网情况，因而能使所有用户享受到语音聊天所带来的好处.-reverse the procedure own voice back-agency service, can make two different LAN client through the Internet for voice communications, point-to-point use of this procedure, not through any intermediary server speed, voice minimal delay, loud realistic, and the real effect of IP phone lines, procedural interface simple, simple operation, the interconnection of the IP phone online playing an excellent instrument, the only requirement is to call both sides have to have a computer, and connect to the Internet. This program can achieve the following networking feature : 1. Both the caller is within the same LAN users. Both the caller is different us

应用背景一个拨号应用程序，任何人（甚至老年人）可以使用。它有大的钥匙可定制任何颜色或大小是非常有用的。大量的设置让它成为你所需要的！对视力不好的人或是完美的老年人！它是很好的长号码拨号！关键技术Android手机拨号上网使用SIP的VoIP协议。它允许使用互联网的免费电话。特点：用于快速大按钮和显示，方便拨号•可选的接触按钮直接从您的联系人列表拨号•用最少的努力迅速增加新的接触号码

This program was designed as a GUI client for the Asterisk PBX with Digium Zaptel cards and SIP VOIP hard or softphones as extensions, it could be adapted to other functions, but It was designed for Zap/SIP users. The program will run on X and Win32. -This program was designed as a GUI client for the Asterisk PBX with Digium Zaptel cards and SIP VOIP hard or softphones as extensions, it could be adapted to other functions, but It was designed for Zap/SIP users. The program will run on X and Win32.

windows/linux平台下C语言编写的sip软电话siphon最新版本。-windows/linux platform C language prepared by the sip soft phone siphon latest version.

RADVISION RTP源代码-RADVISION RTP source code

关于IP电话的文章-The article on the IP phone

一个透明时钟程序-a transparent procedures Clock

visual C#源码，摄像头捕获,视频会议，网络互通-visual c# video caoture,Video meeting