TELEPHONE SYSTEM PROVIDED WITH CALL TIME SERVICE FUNCTION

PURPOSE:To remarkably reduce an operator's burden by simply, quickly and efficiently setting a call time related to plural extension telephone sets. CONSTITUTION:A centralized receiving device DSS provided with a DSS key and its pilot lamp, respectively corresponding to plural extension telephone sets TEL1-TELn, respectively is provided correspondingly in the front extension telephone set TEL1, and in the case a key operation for setting, cancelling or confirming a call time is executed by this front extension telephone set TEL1, control for batch setting, batch cancellation or continuous confirmation of the call time is executed, respectively in accordance with a key input operation of the front extension telephone set TEL1 and the centralized receiving device DSS, in a central control unit 70 of an electronic private branch exchange EX.