| 摘要 |
PURPOSE:To prevent a prank call by detecting andsuccessively storing caller telephone numbers sent from a telephone circuit at the time of incoming calls and prohibiting calling for the stored specific telephone number. CONSTITUTION:At the time of the incoming call, when the incoming call is detected through an incoming call detection circuit 7, the control circuit 11 of a master set 1 inputs the telephone number data of a caller through a caller information detection circuit 8. The circuit 11 transmits the telephone number to a slave set, judges whether or not the telephone number is stored in a memory 10 and when it is stored, decides whether or not a calling prohibition flag is set. Then, when the flag is not set, an incoming call signal is transmitted to a slave set. When the flag is set, the transmission of the incoming call to the slave set is prohibited. The call prohibition flag is set by performing key input from the slave set. |
