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本文介绍了网络电话的特点以及由国际电信联盟H.323所定义的基本框架.文中重点介绍了目前较为流行的五种网络电话,并在文章最后列表给出了各种网络电话的性能对比,以便使用者择优选用.
This article describes the features of VoIP as well as the basic framework defined by the International Telecommunications Union H.323.The article focuses on five of the more popular VoIP today and provides a comparison of the performance of various VoIP services at the end of the article, So that the user preferences.