Features: 1) Make DDD, IDD and local calls, and charge the fee with valid card, such as IC card, magnetic card 2) Make free call without card 3) Not permitted to dial the forbidden phone number preset via management system 4) Two billing modes, polar reverse signal and 16kHz metering pulses 5) Dynamic display the balance of the card and call duration in the call 6) Over-voltage and over-current protection 7) Working under the supervisor of management system 8) Download tariff rate table and parameters to payphones via management system