To hook-up the Person-To-Person® device in a house with VOIP you might need a DSL filter inline with the Person-To-Person® Device as show below. The DSL filter will have 2 RJ-11 Jacks one labeled Phone or a image of a phone and the other labeled Computer or with a image of a computer. The one with the Phone should be connected to the Person-To-Person® devices LINE IN jack. The DSL filter should be connected to the VOIP modem. 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.