Telephone station apparatus with selective restricting of local

Details Telephone station apparatus with selective restricting of local Telephone station apparatus with selective restricting of local

1981-11-20

1984-01-10

Pellinen, A. D.

179 18DA, H04M 166

Patent

active

044254806

ABSTRACT:
Station apparatus is provided for exclusively handling calls without the use of coins including credit cards calls, collect calls, third party charge calls, in WATS calls (800 numbers), emergency calls, directory assistance calls, etc. The station apparatus is especially useful to provide service when interconnected with central office equipment that does not have provisions for automatically blocking local calls, i.e. equipment that does not have local call exclusion features such as found in electronic exchanges. The station apparatus prohibits local calls by opening the loop to the central office if more than a predetermined number of digits are dialed unless the first digit is a "0" or a "1". Thus, the dialing of such numbers as 911, 411, 611, 1911, 0, 0+ is permitted while local calls are prevented.

REFERENCES:
patent: 3992588 (1976-11-01), Hunsicker
patent: 4000380 (1976-12-01), Jackson
patent: 4012602 (1977-03-01), Jackson
patent: 4124781 (1978-11-01), Mellon
patent: 4251692 (1981-02-01), Waldman

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