| 摘要 |
PURPOSE:To evade the transmission of an unnecessary radio wave by enabling a calling subscriber side to judge whether or not a sent call signal is received with a called subscriber side. CONSTITUTION:When it is judged that the call signal modulated by a receiver 1 is addressed to this office, the detector 3 of this office which inputs the call signal outputs signals 31-33 and a voice generator 4 which inputs the signal 31 outputs a message that the called subscriber selects among previously stored voice messages. This voice message is sent to the calling subscriber side by a transmitter 5 through an antenna 2, so that calling subscriber side can judges whether or not the calling signal of the calling subscriber is received with the selective calling the device of the called subscriber. Consequently, the transmission of an unnecessary radio wave can be evaded. |
