Patent Number: 5,036,513
Date of Patent: Jul. 30, 1991
METHOD OF AND APPARATUS FOR INTEGRATED VOICE (AUDIO) COMMUNICATION SIMULTANEOUSLY WITH "UNDER VOICE" USER-TRANSPARENT DIGITAL DATA BETWEEN TELEPHONE INSTRUMENTS
A novel method of and apparatus for voice communication and transparent, non-interfering, automatic digital data exchange between appropriately equipped telephone terminals having cooperative digital signal processing and visual display equipment, using special recognition signal protocol triggering signals and providing modem capability for FAX, printer, microprocessor, answer machines and the like for providing extended services using in-band signaling sensible by users and machines. Such method is useful both with ordinary telephone exchanges and ISDN type exchanges.