Method of providing dialtone first on step by step telephone sys

Details Method of providing dialtone first on step by step telephone sys Method of providing dialtone first on step by step telephone sys

1974-10-02

1976-03-30

Claffy, Kathleen H.

H04M 1700

Patent

active

039476430

ABSTRACT:
A step by step central office serving coin box subsets is provided with a link circuit which on initiation of a call from the coin box sub-set connects the line finder circuit through an auxiliary coin trunk circuit to the central office equipment. This is performed whether or not a coin has been deposited at the coin box sub-set. When the user of the coin box sub-set dials the auxiliary coin trunk determines whether

REFERENCES:
patent: 3456081 (1969-07-01), Pharis et al.
patent: 3579253 (1971-05-01), Edington
patent: 3601541 (1971-08-01), Thompson
patent: 3676597 (1972-07-01), Peterson
patent: 3678203 (1972-07-01), Lorange

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