| 摘要 |
PURPOSE:To transfer a line, which is in service, to a telephone set provided with no selecting button by providing a transfer button and a button selecting a line to be transferred as operation buttons of the telephone set. CONSTITUTION:If the transfer button of a telephone set is depressed when the telephone set A calls through a channel (a) of an exchange SNW, a device CC detects depression information to hold a trunk line C/OA and opens the channel (a) to transmit a dial tone to the telephone set A. When the telephone set A dials the number of a telephone set B, channels (b) and (c) are closed by the local connection control, and the telephone set A is connected to the telephone set B through an IOT, and the device CC issues transfer information to the telephone set B to light the indicator lamp of the transferred line connection button of the telephone set B. As the result, the extension call between telephone sets A and B is possible. |
