FreePBX is described as 'web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server. FreePBX is licensed under the GNU General Public License (GPL), an open source license' and is an app in the Social & Communications category. There are more than 10 alternatives to FreePBX for a variety of platforms, including Linux, Windows, Mac, Android and iPhone. The best alternative is 3CX Phone System, which is free. Other great apps like FreePBX are FusionPBX (Free, Open Source), Wazo (Free, Open Source), FreeSWITCH (Free, Open Source) and Kamailio (Free, Open Source).
FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any other form of media. It was created in 2006 to fill the void left by proprietary commercial solutions.
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FreeSWITCH vs FreePBX opinions
pros, cons and recent comments
FreePBX is a full turn key PBX with GUI. Freeswitch is just the switch and is more similar to Asterisk (what FreePBX runs on under the GUI).
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VitalPBX is a full-feature PBX (phone system) based on Linux and Asterisk. VitalPBX is extremely easy to use, fast and secure. VitalPBX is free to use, including for commercial use, with no limitations of the amount of users.