关于组呼，由于时间有限，现在还没有完全实现，正在逐步完善当中，近期可以完全实现。 基于VoIP技术的PC-to-PC电话系统的研究与实现-Group call, due to time constraints, not yet fully realized, is gradually improving among recent can be fully realized. Research and Implementation of VoIP technology-based PC-