INTERFACE DEVICE AND COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To provide a wireless local loop(WLL) system where a call termination re-reply service conducted by a user equivalent to that of a general stationary telephone set in an existing telephone network. SOLUTION: A subscriber unit for WLL (WSU), which the component of a WLL system, is provided with a timer 105 that measures and outputs an elapsed time, when a WLL stationary telephone set is hooked on and with a control section 101 that compares a measured time of the timer 105 with a prescribed time, when the WLL stationary telephone set is hooked off and outputs an identification code, only when the measured value is the prescribed time or over. Furthermore, a WLL use access unit WAC which is the component of the WLL system is provided with a control section 121, that throws a switch 125 to the position of a terminal 125b.