A microprocessor controller has a central processor, including a microprocessor, to centrally control a PBX and also provide general processor capability to a plurality of data terminals. Any typical centrally controlled PBX design which processes and switches telephone calls between a plurality of trunk...http://www.google.fr/patents/US4440986?utm_source=gb-gplus-shareBrevet US4440986 - Microprocessor controller for simultaneously controlling a PBX and providing multiple user access for general purpose data processing
Microprocessor controller for simultaneously controlling a PBX and providing ...
