| 摘要 |
Each time the time in a timer is re-set, a control section overwrites a difference integration value corresponding to the amount of the change from a reference value "0" in an registration memory of a memory section. When a call is sent from an extension to an outside line, the control section first reads out the difference integration value from the registration memory and stores on a management table the read-out difference integration value and call beginning time information in association with the call-sending extension. If the call between the extension and the outside line is finished, the control section executes an accounting calculation process for a call charge associated with the call-sending extension, on the basis of call end time information, the difference integration value stored in the registration memory at this time, and the call beginning time information and difference integration value associated with the call-sending extension, which are registered on the management table.
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