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Elastix is an open-source Unified Communications Server software package. It combines IP-PBX (private branch exchange) functionality with a telephony server and supports voice, video, and fax over IP networks. Elastix offers a web interface that lets users manage their communication system using a simple graphical environment. The platform can work with both SIP trunking services and traditional phone lines through the integration of analog or digital telephony hardware components. The platform has evolved into 3CX today since it was first released in 2006 by PaloSanto Solutions as Elastix PBX in 2006 and Later renamed to Issabel after being acquired by the company Issabel S.A.

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