If you only have dialup the best solution to receiving faxes is to use a free fax to e-mail service - Tiscali is one such provider.
I use to use FaxMe because of having to be warned first if a fax was being sent, but the service ceased sometime last year.
Tiscali issues you with an individual 0871-xxxxxx fax number and you include it on your cover page. It comes, obviously, in e-mail form and opens and displays as a normal fax sheet(s).
The sender pays the cost of the call and Tiscali receives a proportion of it - that's how it makes what must be a modest profit from the service.