The embodiment of the invention provides a real-time
relay transmission method, device and
system for fax data, which are applied to a first
client front-end device, the first
client front-end device is in communication connection with a first fax
machine, and the method comprises the following steps: after the first fax
machine and a second fax
machine are connected in a call, the first
client front-end device transmits the fax data to the second fax machine; the first client front-end equipment receives fax data sent by a first fax machine; the first client front-end equipment converts the fax data into an image file; the first client front-end equipment decomposes the image file into a plurality of image units, and a plurality of data packets are obtained after the image units are packaged through an
internet protocol; and the first client front-end equipment sends the plurality of data packets to a second fax machine in real time through an Internet session protocol link.