Abstract: The invention is a method and structure for use in a telephone office to translate equipment numbers of prescribed stations served by the office into their associated directory numbers. The method comprises the steps of scanning terminating calls in the office to obtain equipment numbers and the dialed directory numbers of called stations, comparing the equipment numbers of the called stations with the equipment numbers of the prescribed stations, and associating ones of the directory numbers with ones of the prescribed stations whose equipment numbers match the equipment numbers generated by the office during the terminating calls. As used in a preferred exemplary embodiment, the equipment numbers of the prescribed stations are generated by performing the additional step of scanning originating calls in the office to obtain the equipment numbers of stations originating calls of a prescribed type and compiling a list of the equipment numbers so obtained.