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Computer hardware and software systems comprised of interface devices for connecting digital networks, telephone circuits, and telephony protocols (such as Transmission Control Protocol/Internet Protocol (TCP/IP), Digital Signal 1 and Primary Rate Interface (T1, E1, and PRI), and session initiated protocol (SIP)) to telephone systems such as Private Branch Exchanges (PBXs) for business telephony; Computer hardware and software systems comprised of interface devices for interconnecting computer networks and circuits to unified voice, video, and messaging systems for business communications; Computer hardware and software systems comprised of computer software programs for use in integrating computer telephony systems in the field of computer networks; Computer hardware and software systems, namely, central telephony hardware and software for telephony management and control in an enterprise