u will need to use a site like this to send via b/band
http://www.tpc.int/ i used a last year when i had to send some faxes but i dont think u can recieve.....maybe it has changed now though check it out.
if u need to recieve faxes and the above doesnt help i would buy a fax modem i recon u should be able to pickup for £5 or less at computer show cos maplins sell them for £10.
u might even get somebody on here who would sell u 1 as most peeps now using b/band and have no need of a dialup modem