Telephone interface circuit

Details Telephone interface circuit Telephone interface circuit

2007-02-20

2007-02-20

Tieu, Benny Quoc (Department: 2614)

Telephonic communications

Call signal generating

C379S378000, C455S462000

Reexamination Certificate

active

10689250

ABSTRACT:
An interface circuit that interconnects a terminal device at an extension station with the adjunct port circuit of a telephone of a business communications system (BCS), such as a digital PBX. The interface circuit enables a call diverted to a BCS telephone to be answered at the extension station. The interface circuit receives a ringing control signal from the adjunct port circuit when its BCS telephone is rung on an incoming call. This causes a ringing current source in the interface to apply ringing current to the extension station simultaneously with ringing of the BCS telephone.

REFERENCES:
patent: 5926755 (1999-07-01), Ghisler
patent: 5956631 (1999-09-01), Gerszberg et al.
patent: 2004/0248593 (2004-12-01), Hicks et al.

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