What I use on my fax number (the number is in my signature even) is a server running linux with the mgetty-sendfax software on a now somewhat aged PC.
That software simply works for normal dialup access and for receiving faxes. On receiving a fax it sends the fax as an e-mail with attached images in something most modern software will understand.
If anything unix-like is not your thing, there is probably software for windows that does the same.
Koos van den Hout, PGP keyid RSA/1024 0xCA845CB5 via keyservers snipped-for-privacy@kzdoos.xsall.nl or DSS/1024 0xF0D7C263 -?) Fax +31-30-2817051 Camp Wireless, wireless Internet access /\\\\