Programmable subscriber set

US4788720A · kind A · utility

Assignee

• Trillium Telephone Systems Inc. · CA

Inventors

• Robert P. Brennan · Pakenham, CA
• Joseph Camelon · Richmond, CA
• J. Bernard Trudel · Ottawa, CA
• Albert Hum · Ottawa, CA
• Donald G. McLeod · Gatineau, CA

Key dates

• Filing date: Sep 3, 1986
• Grant date: Nov 29, 1988
• Expiry date: Sep 3, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S379/915
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A subscriber set for connection via tip and ring leads to a remote communication system such as a PABX or centrex. The remote communication system is capable of implementing a plurality of special features such as hold, call transfer, call forward, etc. The set is comprised of a microprocessor and electronic telephone circuit connected to a plurality of programmable function keys, for generating one or more centrex or PBX special feature access code signals in response to depression of predetermined ones of the keys. An LCD display is connected to the microprocessor for generating prompt signals for indicating implementation of predetermined ones of the special features associated with depression of corresponding ones of the keys. The special feature access code signals are programmed into the set such that the set may be used with a variety of PABX and centrex facilities in lieu of expensive proprietary subscriber sets or awkward and difficult to use standard type 2500 sets.