Portable Unix Libary

本文主要研究了W-WAN中GPRS网络的移动视频传输问题。文中探讨了GPRS的网络结构、协议体系以及链路特性，从中我们看出： GPRS网络链路不仅具有一般无线链路数据传输中遇到的延迟大、误码率高等共性问题，而且具有移动通信系统采用蜂窝频率复用方式带来的小区切换， 以及由于通信中链路性能随着地理位置变换而变化造成的GPRS网络中不可避免的经常性遭遇的冗长时延和突变时延。 这使得目前GPRS网络中使用的传统TCP或UDP传输协议均不能适应GPRS自身的链路特性，也不能实现高效的分组传输。-This paper mainly studied the W-WAN in the GPRS network for mobile video transmission problems. The article discusses the GPRS network architecture, protocol architecture, as well as link characteristics, from which we can see: GPRS network link not only has the general wireless link data transmission delay encountered in large, common problems of higher bit error rate, and with mobile communications system uses a cellular frequency reuse methods brought about by cell switching, as well as the communication link performance with the location change and change is inevitable GPRS network, the recurrent encountered lengthy delay and delay mutation. This makes the current GPRS network using the traditional TCP or UDP transport protocol are una

基于VOCAL协议栈的SIP用户代理端，可以在linux下进行SIP呼叫-invisible protocol stack based on the SIP user agent side, the under linux SIP Call

It s an introduction to the most popular opensource calling card platform.Its is fair to say that A2Billing when combined with Asterisk is is now a full featured telecom platform

版本V4.1.1,Linux上的开放源代码的IP电话软件SIP协议，主要用于语音通话，但它也支持发送文本的即时消息，即可以像ICQ那样地用文字聊天。 如果网络带宽足够的话，它还支持可视电话 Kphone是GPL的开放源代码的软件。-version 4.1.1, It is IP phone software of Linux open source code based on SIP protocol, it can be used to voice communication, and surpport text IM, same function as ICQ used to text chat. In broad band circumstance, it surpport video conference. Kphone is GPL open source software .

The Java SIP library

Voice over IP (VoIP)VOIP在INTERNET的实现和VOIP技术介绍-Voice over IP (VoIP) Internet VoIP in the realization and VoIP Technology

视频会议中运用的H245协议。详细介绍了H245系列各个协议。是一本不错的参考资料。-video conferencing using the H245 agreement. Details of the H245 series of individual agreements. It is a good reference.

openh323 source code

H.323协议原理 ------VOIP网络基本构成单元-H.323 networks------ VOIP principle agreement constitutes the basic unit

一个ip电话的源代码- A ip telephone source code