You can simply connect the Magic Jack to the OBi's LINE Port and the let the OBi treat it as if it's a landline. When you get an incoming call on either Google Voice or the Magic Jack, the telephone connected to the OBi will ring. By default, the OBi will make outgoing calls on the Magic Jack, but you can select Google Voice instead by dialing **1 before the number. Alternatively, the OBi can make outgoing calls though Google Voice by default but you can select the Magic Jack instead by dialing **8 before the number.