Circuit for automatically releasing holding state of telephone s

Details Circuit for automatically releasing holding state of telephone s Circuit for automatically releasing holding state of telephone s

1984-03-30

1985-11-05

Dwyer, James L.

H04M 100

Patent

active

045515824

ABSTRACT:
An automatic telephone hold releasing circuit for a plurality of telephone sets connected in parallel across a pair of wires of a subscriber's office line, which can automatically release a call placed on hold at one of the telephone sets even when the particular telephone set is on hold with its handset placed in the on-hook position. The circuit comprises means for detecting a voltage drop occurring in the voice-circuit when the handset of a telephone set other than that with which the call has been initially answered is unhooked, means for comparing the dropped voltage with a voltage present when the call was put on hold, and means responsive to an output of said comparing means for deenergizing a relay to open its contacts in response to the voltage drop and automatically release the initially answered telephone set.

REFERENCES:
patent: 4454385 (1984-06-01), Grantland et al.

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