Is there a freeware or very low cost computer program that uses the computer as a fax machine using DSL? 
I use eFax
Free to recieve (with ads), but it’ll cost you if you upgrade to a local number (the number I was given is in Idaho; I live in New York!) or if you want to send.
But if you just need a number to recieve faxes, it’s pretty good.
I use Trust Fax: TrustFax is proud to offer you eFax