Telephonic communications – Reception of calling information at substation in wireline... – Blocking caller id transmission
Patent
1997-05-29
1999-02-16
Hunter, Daniel S.
Telephonic communications
Reception of calling information at substation in wireline...
Blocking caller id transmission
379354, H04M 156, H04M 100
Patent
active
058728384
ABSTRACT:
A trim phone circuit device is composed of a base portion and a hand set portion which is connected with the base portion by a four-core line. The trim phone circuit device is capable of a calling line identification in view of a bridge rectifier circuit unit which has a positive terminal output capable of providing the telephone circuit with the power source and of reading the calling line information furnished by the phone company. When the bridge rectifier circuit unit of the base portion is turned on all the time to keep a calling line signal in the on-hook state on the phone line, the calling line detection circuit unit of the hand set portion is provided with the calling line signal in a single end input configuration so as to enable the trim phone circuit device to identify the calling line.
REFERENCES:
patent: 4924496 (1990-05-01), Figa et al.
patent: 5263084 (1993-11-01), Chaput et al.
patent: 5526406 (1996-06-01), Luneau
patent: 5553125 (1996-09-01), Martensson
patent: 5581599 (1996-12-01), Tsuji et al.
patent: 5659602 (1997-08-01), Gay
Appiah Charles N.
Hunter Daniel S.
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