dellV505 Fax

I have this printer works great use it all the time since i got it last year but i have never been able to send a fax. I work for phone company so yes i have checked all the connections and lines. I have my phone line going through broadband. I used an old brother fax machine using exact  phone cord and wall jack and it works it dials and connects every time. I use my dell fax directly,from the machine nothing to do with my computer i put paper in dial # on the dell v505 machine and it tells me the # cannot be recognized. and then tries again the spits paper out saying the fax didn't go through. I need help/ I called tech support once was on phone for over an hour got nowhere but dell wanting to charge me for tech support. I know warranty ran out but i never tried to use fax while i had warranty and now that my wife needed it its warranty ran out and cant get it to work. Someone please help has to be a setting or something on the machine.

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