说明：  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 descriptions of the software SIP terminal Voice Chat function of key technologies, from the macro and micro perspectives two of the voice chat function of the realization of the process, structure of the system test environment.)