System using a portable call information device

Details System using a portable call information device System using a portable call information device

1992-10-14

1994-02-01

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379355, 379 90, H04M 1274

Patent

active

052838269

ABSTRACT:
Call generating apparatus connected to a call communication line by a connection unit generates a call to the communication line according to information received from a portable device mounted thereon. The connection unit disconnects the connected call connection line if the portable device is unmounted during reception of the information. A permission signal may be sent to the portable device to permit transmission of the information.

REFERENCES:
patent: 4126768 (1978-11-01), Grenzow
patent: 4130738 (1978-12-01), Sandstedt
patent: 4456925 (1984-06-01), Skerbs et al.
patent: 4742351 (1988-05-01), Suzuki
patent: 4766433 (1988-08-01), Herman et al.
patent: 4961217 (1990-10-01), Akiyama

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