| 摘要 |
PURPOSE:To instantaneously originate an extension call and an office line call without the direct current closing of an office side or the sending of a pulsing signal by providing a storing means which stores the pulsing signal from a telephone set, in a customer station simple exchange. CONSTITUTION:In a case to telephone to an office line 1 by a telephone set 31 for instance, after an off-hook, an operator sends the pulsing signal of a first figure. A CPU 11 stores the said pulsing signal of the first figure in a memory 12, and at the same time, it watches whether the pulsing signal of a second figure is inputted within definite time t2 or not. Then, when it detects the pulsing signal of the second figure within the time t2, it decides that this call is the office line call, and makes a direct current close circuit operate, and transmits the pulsing signal, stored in the memory, to the office line 1 successively from the first figure. On the other hand, in the case that the pulsing signal of the second digit is not inputted even if the time t2 elapses after the input of the first digit, the CPU 11 decides that it is an extension call, and executes an extension communication operation.
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