VoIP or Voice Over IP, is to convert the Voice or fax to the data, then share the same IP network with data (Internet, the Internet), on the Internet because of the Voice and fax a free ride on the \ \ \ \ \ \ \ \ \ \ \ \ \ \ "downwind car", so the peer-to-peer - a gateway (gateway) international or domestic long distance communication is completely free, IP network can be Internet, IPLC (international line), wireless network, etc., as long as it is using IP (Internet Protocol), VoIP system is the traditional telephone network and Internet combination collocation are together,
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