Windows XP Home Edition "no dial tone" in Fax Console Status

I have enabled the internal fax program and have double
checked configuration...but faxes do not send...I have
tried using the modem phone number (line is dedicated to
dial-up only)as my "fax number" and I have tried using my
other line as my "fax number" in set-up, which is
dedicated to a phone/fax machine...get "no dial tone"
either way...additionally, is the "fax" supposed to be
sent over the internet (like e-mail) or, as I assume, is
a phone connection supposed to be established and the fax
initiated just as if sending a fax manually?? Finally,
do I need to install a separate fax modem or do I need to
have the internet connection turned off??

any suggestions?
thanks