Off-hook detection and soft line seizure for telephone line shar

Details Off-hook detection and soft line seizure for telephone line shar Off-hook detection and soft line seizure for telephone line shar

1993-08-25

1995-02-21

Dwyer, James L.

Telephonic communications

Audio message storage, retrieval, or synthesis

379 93, 379100, 379 88, H04M 902

Patent

active

053923340

ABSTRACT:
A method for processing an incoming call on a telephone line in a computer system, wherein a telephony circuit detects a pick-up by a parallel device coupled to the telephone line while maintaining high voltage isolation. The telephony circuit performs hard line seizures to cause the parallel device to hang-up and soft line seizures to prevent a central office hang up after the parallel device hangs up.

REFERENCES:
patent: 5036534 (1991-07-01), Gural
patent: 5062133 (1991-10-01), Melrose
patent: 5151972 (1992-09-01), Lorenz
patent: 5265157 (1993-11-01), Jolissaint
patent: 5283638 (1994-02-01), Engberg

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