INTERNAL DIRECT CALL PROCESSING METHOD FOR NARROW BAND ISDN

摘要

To provide an internal direct number service processing method in the switchboard for narrow band integrated services digital network(N-ISDN) to directly call extension subscriber of private interface device from the outside without a help of exchanger. The internal direct number service processing method includes the first step that checks whether the associated subscriber is a private switchboard connection subscriber, the second step that checks numbering form of the subscriber after proceeding the first step, the third step that proceeds valid number after the second step and the fourth step that transmits the analyzed number to the private switchboard. Thereby, it is possible to provide the internal direct number service to directly call extension subscriber of private interface device from the outside without a help of exchanger.