TRANSFERRING SYSTEM FOR TRUNK LINE INCOMING CALL TO ANOTHER TRUNK LINE

摘要

PURPOSE:To automatically evade such state that the recovery of a trunk is impossible, by deciding the permission/no permission of a transfer processing based on data corresponding to both the trunk of a trunk line incoming call and another trunk when the trunk line incoming call is subject to trunk line transferring via another trunk. CONSTITUTION:A central control unit 7 analyzes a dial number, and after deciding the fact that an opponent is a subscriber in an exchange network 5 connected to an outgoing trunk 3, reads out the data representing the presence/absence of a recovery signal with respect to an incoming trunk 2 and the outgoing trunk 3, and decides the permission of connection. In the above decision, when either data represents the presence of the recovery signal, the central control unit 7, after connecting an extension subscriber 6 and the outgoing trunk 3, connects the incoming trunk 2 to the outgoing trunk 3 after the on-hook of the extension subscriber 6. In such a way, when the trunk line incoming call is transferred via another trunk line, it is possible to prevent the automatic recovery infeasible state of the trunk due to transfer from being generated in a case where both exchange networks connected to two trunk lines are not provided with the recovery signals.