The disclosed invention relates to a communication system using a RAM disk, receiving a voice signal input from the outside in real time with the RAM disk to receive back from the hard disk to the time required to check the bus state has been temporarily stored.; A plurality of exchange means for the device of the invention is to be output to the user an audio signal outputted from the line interface means in response to a plurality of external call line and the extension control signal input from the line interface means and, outside this call line is associated with, and signal conversion means for compressing the audio signal outputted through the exchange means, in response to a control signal input from the external storing the audio signal compressed by the signal conversion means temporarily, and outputs an audio signal stored temporarily in the hard disk, and , and a RAM disk and outputting to an external call line to a pre-stored speech signals over the line interface means, and controlled so as to output an audio signal stored temporarily in the RAM disk, in response to a signal input according to a user's operation to the hard disk, external call If the line is connected to a preset sound through an external call line And a host CPU for controlling so that the output Holy call.; Accordingly, the present invention calls bottleneck by enabling the system to be backed up from the hard disk at the time required, the data bus and then stores the audio signal input from the outside in real time by using the RAM disk of the release frequently occurs in many call load zone it can be removed there is an effect that is always able to provide the monetary system works properly.
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