This source code has a useful information for all beginners using SIP server and developing an application like softphone. Also can Transmit and Receive voice by replacing the IP address.

出版《多媒体技术: 计算、通讯及应用(英文影印版)》牛人使用的RTP通信服务程序，可以用来做多媒体通信快速实验，只支持MPEG-1编码。服务器功能相当于IBM s VideoCharger. -The KOM(S) Streaming System provides a server, a client, and a proxy cache for audio/video streaming. The first and foremost encoding format that we use