An Internet Protocol Private Branch Exchange (IPBX) is a telephone exchange, local to a building or area, whose calls are managed and processed within an Internet Protocol (IP) network, such as a Local Area Network (LAN). Access to and from both internal IPBX systems, and external telephone networks, including the Public Switched Telephone Network (PSTN), is controlled by a network device referred to as a gateway. IPBX systems offer call transfer, PC phone integration, speed dialing, and voicemail, as well as privacy and control to its owners. H.323, MEGACO (an upgrade to MGCP), and SIP are all examples of IPBX standards.
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