| 摘要 |
PURPOSE:To execute easily a call to a listener, and to execute immediately a mutual call between a caller and the listener by connecting a controlling circuit to the transmission side and reception side telephone sets, respectively, and providing an incoming detecting circuit, controlling circuit and a call end detector, etc. on said controlling circuit. CONSTITUTION:A telephone set 1 of a caller is connected to the listener side telephone set 2 of telephone transfer device a telephone transferring system. To this telephone set 2, a reception side telephone set 3 is connected through a controlling circuit 5, and a telephone set of a going-out destination from a listener carrying a pocket bell is connected to the telephone set 3. To this circuit 5, incoming detectors 15, 16 for detecting an incoming call of the telephone sets 2, 3, and busy detectors 28, 29 are connected. To said each detector 15, 16, 28 and 29, a controlling circuit 17 and relay contacts 11-14 of circuit control relays 24A, 24B are connected. Also, to the circuit 17, a call and detector 18, dial pulse generator 22, memory 33, bi-directional amplifier 27, etc. are connected, and a call between the listener and the caller can be executed. |
