AUTOMATIC TELEPHONE PRIVATE BRANCH EXCHANGES; COMPUTER HARDWARE AND INTERFACE SOFTWARE THAT INTEGRATES DIRECTLY TO A PBX TELEPHONE SYSTEM OF A BUSINESS FOR ENABLING CALL HANDLING OR CALL CENTER FUNCTIONS IN THE NATURE OF CALL ROUTING, CALL TRANSFERS, INCLUDING CALL TRANSFERS TO INTERNAL EXTENSIONS AND REMOTE OR MOBILE TELEPHONE NUMBERS, TELEPHONE CONFERENCING, AND VOICE MESSAGING; TELEPHONE SYSTEM COMPRISING COMPUTER HARDWARE AND SOFTWARE THAT EXTENDS PRIVATE BRANCH EXCHANGE SYSTEM AND CALL C...