To attain accurate communication, even when communication terminal equipment corresponding to a caller telephone number notice service is connected to a line of a service contract/a non-contract.
Communication terminal equipment detects a 16Hz signal (120, Y) and discriminates whether the 16Hz signal is an ID reception terminal start signal (CAR) or a call signal (IR) with a cadence that is one of electric conditions. In the case that the detected 16Hz signal is the CAR (122, Y), a timer A is operated (132) and a caller telephone number is received (134). Continuously when the detected 16Hz signal is the IR (124, Y) and the timer A is in operation (126, Y), a bell tone is generated (128) to make a reply operation. That is, the reply operation is made, only when the IR is received within a prescribed time after the communication terminal equipment received the CAR.
KOUNOE TOSHIAKI
SUDO NAOKI
HIROSE HIDEYUKI
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