ＩＰ传真即 ＦｏＩＰ，是通过专用或 Ｉｎｔｅｒｎｅｔ协议（ＩＰ） 网络而非传统的公共交换电话网络（ＰＳＴＮ）进行传真的方式。利用ＦｏＩＰ收发传真，对终端用户来说，感觉不到与普通收发传真有什么区别。而实际上，ＦｏＩＰ作原理与传统的ＩＰ传真是有很大区别的。首先， IP fax, FoIP, is a method of faxing over a private or Internet Protocol (IP) network instead of the traditional Public Switched Telephone Network (PSTN). Use FoIP send and receive faxes, the end user, do not feel any difference with the ordinary send and receive faxes. In fact, FoIP for the principle and the traditional IP fax is very different. First of all,