Communication apparatus having a communication hold function

Details Communication apparatus having a communication hold function Communication apparatus having a communication hold function

1987-12-18

1989-09-26

Schreyer, Stafford D.

Telephonic communications

Multi-line or key substation system with selective switching...

Detail of hold circuitry

379393, H04M 172

Patent

active

048706809

ABSTRACT:
A communication apparatus such as a telephone set has a hold circuit for putting a telephone call from a communication partner on hold, a release circuit for releasing the telephone call from the on-hold condition, a circuit for informing the communication partner when the telephone call is released and a detect circuit for detecting when the communication partner whose telephone call is on hold breaks the line, e.g. by hanging up. The communication partner is informed of the release of the on-hold condition in accordance with such release and the detection of line break by the detect circuit.

REFERENCES:
patent: 3961142 (1976-06-01), Caffine
patent: 4731822 (1988-03-01), Berry et al.

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