| 摘要 |
PURPOSE:To set an optional number of trunk lines or extensions to respective keys of respective telephone sets by providing setting memories corresponding to the respective keys of a telephone set. CONSTITUTION:Telephone sets 1-1 and 1-2, telephone set interface circuits 2-1, 2-2..., and trunk circuits 3-1, 3-2... connected to the main device are all connected to a speech switch 4 as speech channels. Therefore, a channel is formed between optional points according to an indication from the call processing means 8 in a connection processor 5 to enable a talk. The call processing means 8 on receiving that controls the speech system of the telephone set interface 2-1, trunk circuit 3-1, speech switch 4, etc., and then informs a key converting means 7 of the state of the extension or trunk line. Then, the circuit number and key number of the telephone set to which the extension or trunk line is set are taken out and a telegraphic message shown in a figure is transmitted to a corresponding lamp, etc. Therefore, the state of the extension or trunk line is displayed on a display device corresponding to respective keys of each telephone set. |
