CALL RECEPTION CIRCUIT

PURPOSE:To simplify the circuit constitution and to prevent the cost increase. CONSTITUTION:When a transfer contact k1 is thrown to the position of a normal connector terminal NC, a current larger than that of a current of a DC closing circuit 5 flows a photocoupler IC1 by an incoming signal received from electric communication lines L1, L2. When the transfer contact k1 short-circuits an incoming signal extraction circuit 1, the DC signal from the electric communication lines L1, L2 passes through the transfer contact k1 short-circuiting the circuit 1 as above and is fed to a DC closing circuit 5, then a telephone set is brought into the line acquisition state.