Traffic between private automatic branch telephone exchanges

Claim 1

IN AN AUTOMATIC TELEPHONE NETWORK, IN COMBINATION, PUBLIC AUTOMATIC TELEPHONE EXCHANGES; GROUPS OF ARBITRARILY LOCATED PRIVATE AUTOMATIC BRANCH EXCHANGES; EACH OF SAID BRANCH EXCHANGES HAVING A SUBSCRIBER''S NUMBER IN THE NUMBERING RANGE OF THE PUBLIC EXCHANGES AND EACH BRANCH EXCHANGE FURTHER HAVING A PRIVATE NUMBERING RANGE COMMON TO ALL PRIVATE BRANCH EXCHANGES IN THE RESPECTIVE GROUP FOR TRAFFIC WITHIN THE GROUP; JUNCTION LINES IN SAID NETWORK INTERCONNECTING SAID PUBLIC EXCHANGES; LINES CONNECTING EACH PRIVATE BRANCH EXCHANGE IN A GROUP TO A PUBLIC EXCHANGE; REGISTERS IN EACH PRIVATE BRANCH EXCHANGE IN EACH GROUP, MEANS IN SAID REGISTERS FOR REGISTRATION OF NUMBERS IN SAID PRIVATE NUMBERING RANGE; MEANS CONNECTED WITH SAID REGISTERS TRANSLATING PRIVATE NUMBERS ASSIGNED TO ANOTHER BRANCH OR EXCHANGE FOLLOWED BY THE PRIVATE NUMBER DESIGNATING THE BER OF THE CALLED PRIVATE BRANCH EXCHANGE IN THE PUBLIC NUMBERING RANGE; AND TRANSMITTER MEANS FOR SENDING SAID SUBSCRIBER''S NUMBER TO THE RESPECTIVE PUBLIC TELEPHONE EXCHANGE FOLLOWED BY THE PRIVATE NUMBER DESIGNATING THE CALLED LINE WITHIN THE CALLED PRIVATE BRANCH EXCHANGE.