SUBSCRIBER CONTROL DEVICE

摘要

A subscriber control device comprises a scan input table and a last look table. The scan input table stores respective current line states of a plurality of analog subscriber lines. The last look table stores respective preceding line states of the plurality of analog subscriber lines and pieces of information for validating or invalidating respective timers. The scan input table is compared with the last look table at every predetermined cycle. When they do not match, it is judged whether the line state has changed or which timer is validated. Based on the judging result, an analog subscriber control is performed according to an instruction specified e.g. by a call processing unit. The analog subscriber control is any of a call origination monitor, a dial monitor, a HIT monitor and the like.