基于广域网的语音聊天系统，任一端可以发起连接，但先的知道对方IP-based WAN voice chat system, the end should be initiated connectivity, but the first to know each other IP

SIP 终端语音聊天的设计与实现-。概述了SIP 终端软件的设计思想，并详细介绍了SIP 终端软件中语音聊天功能的关键技术， 从宏观和微观2 个角度阐述了语音聊天功能的实现过程，构造了系统测试环境。-SIP terminal Voice Chat Design and Implementation-. An overview of SIP terminal software design, detailed descr iptions of the software SIP terminal