利用vaxVoIP开发工具包以及MFC开发的一个简单VoIP电话，非常简单易懂，功能却不少，基本实现所有的VoIP功能-VaxVoIP use MFC Development Kit, as well as the development of a simple VoIP phone, very simple and easy to understand, but a lot of features, the basic realization of all the VoIP functiona