FoIP (Fax over Internet Protocol) is a method of sending faxes over the Internet or via your Wide Area Network. FoIP changes the transmission method of faxing in much the same way that VoIP (Voice over Internet Protocol) changes the transmission method of a phone call.
In both FoIP and VoIP, data travels most of the distance between the sending and the receiving devices on a packet-switched network,
often avoiding the long-distance phone lines of the telephone network.
This reduces the transmissions costs and can be a more efficient setup for a business that already has access to Internet or a Wide Area Network.
It is a common misconception that all the fax transmissions from end to end are conducted over IP.
Unless you are sending messages within the organisation this will not generally be the case; you will need to switch out through your PSTN gateways to send to the recipient fax machine.