Fax replacement software?

Thanatos

Is there good software out there (doesn't have to be free) that replaces a fax machine? Like, allows you to send/receive faxes via a fax number in, say, .pdf format, or something similar? Keeps a record of incoming and outgoing faxes? And maybe even allows you to attach a file number to a fax, so you can bill for them?

Feedus

There is this http://www.faxage.com/ . It isn't really software, more like a web application. I think there is a monthly fee, but you can set it up so all the incoming faxes go to your email. And if you want to send a fax you can just email the fax to them.

Feral

It's more network/server oriented, but Zetafax is a good product. I've implemented Zetafax servers as complete fax machine replacements for medical clinics to improve privacy.

Thanatos

Also, I think I'd probably prefer a solution that still involves a single point of contact for all faxes.

Feral

Zetafax can receive a fax on an analog modem or BRI fax card or ISDN card and then save it as PDF either in a specific server location or email it to a specific address. It's kind of nice in that there's never a paper copy sitting in a machine somewhere that a nosy admin can just pick up and read.