The communication device has: a first communication transceiver for transmitting and receiving communication with a first facsimile machine via an analogue link; a second communication transceiver for transmitting and receiving communication with a digital communication network via a digital link; a converter to convert an analogue signal to a digital signal; a memory adapted to store the telephone number of a second, remote, facsimile machine receiving a fax to be transmitted, and to store in memory a digital data file corresponding to the conversion of a fax in analogue form into a digital file by the converter; and an electronic controller having a first simulator simulating an analogue telephone network, a second simulator simulating the second facsimile machine ready to receive a fax, and a forwarding device to forward digital data via the digital communication network which contain the digital file corresponding to the fax.