FreePBX is described as 'Web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server' and is a IP PBX system in the social & communications category. There are more than 25 alternatives to FreePBX for a variety of platforms, including Linux, Mac, Windows, Android and iPhone apps. The best FreePBX alternative is Asterisk, which is both free and Open Source. Other great apps like FreePBX are 3CX, RingCentral, FreeSWITCH and Yate - Yet Another Telephony Engine.
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