SYSTEM FOR LIMITING TERMINATING CALL BY NUMBER OF ORIGINATING PARTY

摘要

PROBLEM TO BE SOLVED: To limit connection of terminating call such that only a terminating call originated from a subscriber number registered or not registered in a private branch exchange is connected. SOLUTION: A list of the number of originating parties for granting connection or rejecting connection is stored in an external storage EM 7 and collated with the number of an originating party received from an office line at the office line terminating call thus limiting terminating call.