Telephone headset on-line indicator

Details Telephone headset on-line indicator Telephone headset on-line indicator

1990-12-13

1993-05-11

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379387, 379396, H04M 105

Patent

active

052107914

ABSTRACT:
A telephone headset on-line indicator uses a light emitting diode located on a boom of a headset to indicate that the user is on-line with another telephone. Circuits are described for use with use with conventional telephones, electronic telephones and PBX telephone base units.

REFERENCES:
patent: 4175217 (1979-11-01), Williams
patent: 4754484 (1988-06-01), Larkin et al.

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