American Telephone and Telegraph, Co.

At&t Information Systems Inc.

Daniel H Dawdy

Edmund Thomas Burke

Timothy M Rubert

A PBX system is responsive to an incoming call which is directed to an adjunct of the system for sending a ringing signal over a station facility to the adjunct. When the adjunct goes off-hook, the system outputs to the adjunct over the station facility multi-frequency tones containing information associated with the incoming call prior to establishing a connection between the adjunct and calling party. The information selects the proper operating mode of the adjunct and provides other call processing information to the adjunct. The adjunct communicates information to the PBX using a switch-hook flash and multi-frequency tones.

Growing community of inventors

Marlboro, NJ, United States of America

Daniel H Dawdy