Apparatus for automatically recovering speech path of telephone

Details Apparatus for automatically recovering speech path of telephone Apparatus for automatically recovering speech path of telephone

1997-04-25

1999-11-16

Eisenzopf, Reinhard J.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379377, 379387, H04M 100

Patent

active

059871199

ABSTRACT:
An inadvertent off-hook apparatus for use in a telephone system having a handset for automatically restoring an inadvertently off-hook telephone to an on-hook in order to receive an incoming call. The apparatus comprises a current sensing unit comprising a photo-coupler coupled to one of a tip and a ring terminal of the telephone line, for sensing variations of current of the telephone line in response to an incoming call and detecting a handset misplacement signal indicating that the telephone is in an inadvertent off-hook condition; and a control unit connected to the current sensor unit, for disconnecting the voice network from the telephone line to block the speech path in response to the handset misplacement signal, and for connecting the voice network to the telephone line to form the speech path to answer the incoming call.

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