Systems for and methods for PBX toll restriction

Details Systems for and methods for PBX toll restriction Systems for and methods for PBX toll restriction

1976-01-29

1977-12-20

Cooper, William C.

H04M 166

Patent

active

040643727

ABSTRACT:
Centralized toll restriction for private branch exchanges (PBXs) is performed by providing first and second memory addresses in the number translator of a central office switching system. The first and second addresses are matched with restricted telephone calls and unrestricted telephone calls, respectively. Those telephone lines of each PBX which are to be restricted are marked in a convenient manner, such as with tip to ground marking, while those telephone lines not restricted are left unmarked. Outgoing trunks between the PBXs and the central office switching system are temporarily marked with an unbalance upon going off-hook on a restricted telephone line, in order to transmit restriction indication to the central office switching system.

REFERENCES:
patent: 3931476 (1976-01-01), Matthews

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