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FusionPBX is an open-source VoIP GUI (Graphical User Interface) designed to manage voice and video calling. The software works with the FreeSWITCH telephony platform to offer a complete communication system by handling user extensions, call routing, voicemail and other functions associated with PBX systems. FusionPBX allows users or administrators to set up virtual tenants — independent virtual instances of the PBX system — which can operate under a single installation.