| 摘要 |
a bell sound selecting key detector(13) for, when predetermined key data is generated from a key input(2), detecting if the key is the bell sound selection key; a telephone number recognizing circuit(14) for allowing the redialing function to be performed through a dialing section(3) when a predetermined control signal is outputted from a micoromputer(11); a ring signal input time detector(15) for detecting a ring signal input time transmitted through a line(L); a bell sound switch(16) for connecting one of a plurality of bell sound drivers(17a-17n) to a line(1); and a relay(RL) for breaking the line(L) for a predetermined period of time according to a control signal of the microcomputer(11) which generates after the generation of the initial dialing signal.
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