Is it possible to use my multifunction printer to fax over the Internet?

RapidFax.com

I just bought a nice multifunction printer, that has auto-document feeder and faxing capability. However, I do not have a land-line (I rely only on my cell phone service). Is there a way to get my fax / scanner / printer to fax over the Internet?

Fax, I have DSL. I do have a modem but I dont use a phone line. I have magic jack for our phone. Is there a ?

way to fax over the internet without using my dial up modem.

How do you send a fax over the internet?

Is it possible to fax over the internet? Where can I do it for no cost?