HI! Just a quick question on The Sandman Door boxes ,, do i need the Controller also if i am using it on a Analog station port setup as a hotline to ring ding group?? I know the unit is line powered ,, or i will go with a Viking E-30EWP . I have never used the Sandman products. Its going on Samsung DS616 ,,I can't get samsung doorboxes they don't make them anymore. Thks for any help.