| 摘要 |
PURPOSE:To answer by use of a specific message confidential to a third person, to only a specific calling party to whom a special number has been taught in advance. CONSTITUTION:In case of absence, a changeover switch 3 is detached from a telephone set 2 and is set to the lower side. When a ringing tone is sent from a switchboard in this state, it is detected by a ringing tone detecting circuit 4, and is transmitted to a sequence controlling circuit 9. The sequence controlling circuit 9 operates an off-hooking circuit 5, forms a call state, informs to a calling party the first message informing that a called party is absent by operating a plural message sending-out circuit 6, and also connects a telephone circuit 1 to a push-button signal receiving circuit 7 by operating a connecting switch 8. After that, when the calling party sends out a special number by operating the push-button, the plural message sending-out circuit 6 is operated again and sends out the second message. |
