If you have a secured network in your office and a multifunction printer you can route all your faxes to an email account in your network. You will need a phone line for your mutifunction printer.
Others on this board have used updox.
I still prefer my $ 15 a month phone line that I plug into my mutifunction networked printer and receive unlimited faxes routed to a secure email in my office network.
Hope this helps
Grenville