how does a fax machine work...?

Question

how are the messages sent and received based on the fax number?

Answer 1

Fax machines have a scanner and a modem built in. It scans the image of the document, translates it into an analog signal, and sends it over a dial-up connection. It is pretty much the same as sending data through a dial-up connection on a computer.

Answer 2

Connect the machine with a telephone line.

Answer 3

http://www.howstuffworks.com/fax-machine.htm