A method for a private branch exchange with house -, - figure, consult -, - calculate these possible and as a function of the three connection

摘要

The private branch exchange, which has enquiry call capability, makes use of a series of processes which are initiated by the bried interruption to the loop. This interruption of the loop is performed by the enquiring station. The construction of the connection for the enquiry takes place by means of the selection of the enquiring station code when an existing, outgoing or incoming exchange connection exists. When the enquiring station is engaged, an intrusion is made into th is existing connection. After an announcement of the station enquired about, the waiting exchange subscriber is connected over the engaged exchange line.