Apparatus for converting a standard telephone to an unlisted num

Details Apparatus for converting a standard telephone to an unlisted num Apparatus for converting a standard telephone to an unlisted num

1985-03-08

1987-01-27

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

At substation

329200, 329373, 329386, H04M 157

Patent

active

046395520

ABSTRACT:
The apparatus of this invention is a system which is attached to a standard telephone instrument at a receiving station. When a call comes from a transmitting station through a switching station, this call is received in this apparatus, which signals the transmitting station to send its private code. After validating this code, it serves to indicate information about the transmitting station. The receiving station then has the option to answer or not to answer.

REFERENCES:
patent: 3784721 (1974-01-01), Kilby
patent: 4266098 (1981-05-01), Novak
patent: 4405839 (1983-09-01), Groff
patent: 4409439 (1983-10-01), Gamble
patent: 4429188 (1984-01-01), Allen
patent: 4446334 (1984-05-01), Groff

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