To hook-up the Person-To-Person device you connect it as show below. Connected the Person-To-Person devices LINE IN jack into the Wall Jack. Plug the Power Adapter into the wall outlet. Connect your phone into the PHONE Jack on the Person-To-Person Device. Connect you answering machine into the ANS MACH Jack on the Person-To-Person Device. If you wish to have blocked calls not go to the answering Machine then leave the ANS MACH Jack on the Person-To-Person Device empty, and connect the answering machine in the PHONE Jack and connect your phone into the Answering Machine. Note this might require a splitter.