| 摘要 |
PURPOSE:To make possible prevention of a malicious call and protection of converting operation in case of abnormal plural information by concentrating the varied information from a same subscriber's line. CONSTITUTION:The subscriber's line information scanned in every stated period is stored in present look memory PL 102 and the subscriber's line information of the last scanning is compared with the present one by last look memory LL 101 and subscriber's line change detecting circuit LND 103; the existence of subscriber's line change is judged. When some change is detected in LND 103, same subscriber judging circuit JUG 200 judges whether the information of the same subscriber's line stored or not on queque register CDTQ 104. When the information has already stored, JUG 200 abolishes it and, when it is not yet stored, JUG 200 stores it; then, LL 101 is renewed. As the result, the plural change status of a same subscriber can be concentrated. |
