Caller ID telephone security device

Details Caller ID telephone security device Caller ID telephone security device

1992-09-17

1994-09-27

Chin, Stephen

Telephonic communications

Reception of calling information at substation in wireline...

Blocking caller id transmission

379 79, 379 82, 379199, H04M 156, H04M 164, H04M 166

Patent

active

053512898

ABSTRACT:
Apparatus for automatically controlling the application of the power ring signal of an incoming call generated by the telephone company to a telecommunication device by way of an electronic switching device connected in series with the telephone line. The electronic switching device is controlled by logic circuitry operating in conjunction with circuitry designed to receive and demodulate the caller identification data signal provided by the telephone company during the silent interval between the first and second power ring signals of an incoming call. The logic circuitry maintains the electronic switching device in a nonconductive state, while the telephone company caller identification data received is used to determine whether to continue to suppress the subsequent power ring signals, or allow them to pass to the connected telecommunication device by actuating the electronic switching device to the conducting state. Additionally, provision to interface the logic circuitry to the expansion bus of a computer, thereby applying the greater data processing flexibility of the computer to the processing of the caller identification data and the control of the power ring signal, is taught.

REFERENCES:
patent: 4582956 (1986-04-01), Doughty
patent: 4924496 (1990-05-01), Figa et al.
patent: 4926470 (1990-05-01), Sanford
patent: 4937854 (1990-06-01), Sarakas
patent: 5003595 (1991-03-01), Collins et al.
patent: 5031205 (1991-07-01), Phillips
patent: 5036534 (1991-07-01), Gural
patent: 5138652 (1992-08-01), Hashimoto
patent: 5220599 (1993-06-01), Sasano et al.

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