US Robotics modem

I have a US Robotics external fax modem(USR015630B) which connects via a parallel port. Suse 9.0 Pro recognises the parallel port, but no way can I get it to recognise the modem. Neither Kinternet, Qinternet nor Kppp work. I have heard that this modem works with Linux - notably Red Hat - but I can't manage to get it to work for me! Can anyone help, please? Cheers, David