通过RTP协议进行通讯的完整例子，本人已经在VC6上编译通过。 可以向支持SIP协议的服务器发起VOIP呼叫,并可以进行文字、视频、文件的传输。-through RTP for a complete communications example, I have compiled the VC6 through. To support SIP Server launched VoIP call, and can be text, video, document transmission.

Unified Sniffing System VoIP and Video Sniffer support h264 video and G711 G722 and ... audio codec support SIP and SCCP call signaling protocols

android sip phone音视频通话需要的库(android sip phone,video call library!)