Dialed number to function translator for telecommunications switching

Abstract

A telecommunication switching system adapted to be connected to lines and trunks has a digital switching network and a control complex for executing system operational functions by program operated processors in response to dialed numbers received from stations in separate customer groups. Customer groups are groups of stations on discrete sets of lines served by the system, all customer groups sharing the hardware forming said switching system while all operational functions are normally separately executed for each customer group in response to dialed numbers included within a separate comprehensive number plan for each customer group. Representative system operational functions include processing standard calls between stations on lines in the same customer group and processing conference calls between multiple stations. The control complex provides a dialed number to function translator in the form of addressable data base memory which provides function-instruction data in a multiple level table structure of separate groups of locations for each customer group of stations, each location having coded electrical signals representing an identifier word including an instruction to execute one system operational function. The data base memory also provides restricted class of service information among customer groups. The processors address locations in memory fields in response to coded electrical signals representing an originating station, and address locations in the table structure in response to the combination of coded electrical signals representing a dialed number received from said originating station and those identifying the customer group of said originating station.