HP Photosmart C6180 All-In-One InkJet Printer "fax wont distance" Questions

I cant get my fax to fax long distance. It says standard and it wont fax long distance. I have to change what setting? Hi Please provide me the your fax model no. that easy to solve your problem.

...fax long distance and it is not allowing me to. When I had the all in one printer at my house it was working. Do you have any idea why it wont go through? make sure that the number looks like this ...