DOMESTIC BRANCH OF EXCHANGE

摘要

PURPOSE: To allow a caller to transit to the maintenance state without need of the operation by the user when an ISDN lane is used. ;CONSTITUTION: A maintenance personnel of a domestic branch of exchange 11 registers in advance its own telephone number to a caller number storage section 16. When the maintenance for the private branch of exchange 11 is controlled remotely by using an ISDN line 12, a call control section 14 recognizes a maintenance request at the arrival of a call by having only to inform its own caller number through the ISDN line 12 and the maintenance state is transited without giving any notice onto the user of the private branch of exchange 11.;COPYRIGHT: (C)1993,JPO&Japio