高性能的可视电话软件 NetTalk效率很高，比我所见的一些可视通话软件要好（如AVPHONE，注：在此并无破坏AVPHONE所在公司形象之意图，仅将软件作客观上的比较） 全图形界面 全图形的界面使得操作方便快捷-high-performance video telephony software NetTalk high efficiency, I have seen some better visualization software calls (such

sipXtapi is a comprehensive client library and software development kit (SDK) for SIP-based user agents. It includes SIP signalling support as well as a media framework. A complete and very feature rich softphone can be built easily by adding a graph

ims sip客户端的实现，在linux以图形界面操作-ims sip client to achieve, in a graphical interface linux operation