You should always homerun your phone wiring to a central location. Even if you are only doing a 2 line system. Daisy chaining phone wires does nothing but cause problems. If a drywaller sends a screw through one of your wires, or Mrs. Jones decides to hang a picture and drives a nail into a wire then everything from there on is dead. If you don't want to homerun every phone wire, at least homerun one from each room that has a line in it. Another added bonus to homerunning them is you always have extra conductors if you need them.