Ok so thers only really one phone jack?
if that is the problem call someone to install another one near by or wherever for about 10-20 bucks
Next install the DSL Cable directly to the phone jack without using a filter, coneect the DSL Cable to the modem and so forth.
next install a filter in the phone jack that is not connected to the DSL line and then connect ur phone to that filter.
any problems im here for ya