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The telephone should do couple of things using two wires, that is it should transmit signal and voice. In this the signal is nothing but a ring tone which alerts the receiver that the call is coming or some one is calling. In this whenever the call was attended by receiver the switch that was in the phone keeps the resistance in active state, that means a resistance short across the wires that makes the current flow along the wire to the exchange office. With that the switch knows that the subscriber picked up the phone. By the moment the call was attended by receiver the switch that was connected to the bell will get disconnected from the transmitting signal and connects to voice part so that, makes subscriber to talk with the caller.

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