Telephone line hold and hold release apparatus

Details Telephone line hold and hold release apparatus Telephone line hold and hold release apparatus

1985-03-25

1987-06-16

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Hold circuit

379396, H04M 172

Patent

active

046741186

ABSTRACT:
A telephone line hold and hold release circuit which, after a central office line which is connected to at least two telephone sets in a telephone terminal system has been seized in response to an incoming call and then placed on HOLD, releases that central office line from the HOLD condition in response to either (i) the re-closing of the hookswitch of the telephone set which seized the central office line, or (ii) the closing of the hookswitch of another telephone set connected to that central office line, or (iii) the release of the central office line by the caller.

REFERENCES:
patent: 4387274 (1983-06-01), Stein et al.
patent: 4440981 (1984-04-01), Grantland et al.

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