The internet protocol and fax protocols are not compatible, the internet is a set of digital packages and fax is a continuous analogue stream. To fax by the internet your computer would have to translate a graphics or text scan into fax (lots of programs for that) then translate into internet, then send to another INTERNET modem, into a computer to translate into fax, then export to the fax receiving machine. The receiving end would have to be set up for this. There are internet fax services (monthly or annual fee) available where you send them a graphics or text file, they translate into fax and send it by phone to the receiving fax machine.
[This message has been edited by Lefty Scaevola (edited July 18, 2001).]