Off the shelf product like GE's 4 line telephone. Three phone lines is all you'll need. 1 main that rolls to the second. If you want the second rolling to the third (fax) I would suggest a line share device like Command communications 5500. Go with dsl if you can get it. It's usually half the cost of cable. 2 phones, fax, line share, answering mach approx 400.