Master unlock circuit for a feature telephone station...

Details Master unlock circuit for a feature telephone station... Master unlock circuit for a feature telephone station...

H - Electricity

04

M

379/23

H04M 1/50 (2006.01) H04M 1/673 (2006.01)

Patent

CA 1223991

MASTER UNLOCK CIRCUIT FOR A FEATURE TELEPHONE STATION INCLUDING A SIGNALING LOCK CIRCUIT ABSTRACT OF THE DISCLOSURE A circuit which unlocks the signaling circuit of a feature telephone station after it has been locked. A microprocessor disconnects a tone generator from an associated keypad upon detection of operation of a lock button. The microprocessor subsequently connects the tone generator to the keypad upon detec- tion of operation of the lock button and a predeter- mined master unlock code provided via the keypad. The microprocessor also connects the tone generator to the keypad upon detection of operation of the lock button followed by simultaneous operation of a predetermined plurality of telephone feature buttons.

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