| 摘要 |
PROBLEM TO BE SOLVED: To set an automatic answering mode when the telephone set is in the state of standby for at least a specified period. SOLUTION: A telephone set state detecting part 6 detects that key operation of key telephone sets 7a-7c are not performed for a specified time, and informs that to a system control unit 1. The control unit sets the automatic answering mode to the key telephone set for which it is detected that key operation is not performed for a specified time. When an originating/terminating call connection control unit 4a detects a terminating call from a telephone circuit corresponding to the above key telephone set, the system control unit 1 controls a time division switch 2 to connect a transmission line of an audio signal between the control unit 4a and a voice recording/regenerating part 5, controls it, regenerates a speech message for speech guidance which is previously recorded for automatic answering, transmits the message to the telephone circuit, and stores a speech message of an originating call subscriber in accordance with the content of a speech message for speech guidance.
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