IP fax is a fax feature that sends and receives data over an IP network. It provides the following benefits.
Reduced communication costs
High speed communication
Real-time communication, just as with standard fax machines that use telephone lines
IP fax allows you to send and receive the following types of faxes.
Send and receive between IP fax-compatible devices on an intranet
Using a device known as a VoIP gateway that creates a relay between the IP network and telephone lines, you can send and receive faxes to and from G3 fax-compatible devices connected to telephone lines.
Note that there is a communication cost for the section from the VoIP gateway to the destination. (This is therefore a pay-as-you-go system based on distance/time).