Pull it apart and see what wires are there. Based on the age, the speaker/microphone will probably not be worth keeping, but having wire inside the walls is a useful thing, just got to determine what kind of wires and where they go.
Pull it apart and see what wires are there. Based on the age, the speaker/microphone will probably not be worth keeping, but having wire inside the walls is a useful thing, just got to determine what kind of wires and where they go.