Free Faxing

So I need to send and receive faxes from time to time.  However a dedicated fax line is out of the question.  Naturally I turned to the world wide web to solve the problem.  I found that faxzero.com is an easy way to send a fax, and faxbetter.com is an easy way to receive faxes.  However  faxbetter.com will deactivate your number if you don't use it for 7 days, so you'll need to keep that in mind.  And of course these are free, though they have premium services available.