VitalPBX is a free phone system based on the solid Linux and Asterisk platforms, offering whole new level of user experience with offers fully-responsive user interface that looks great, and is easy to use, on any screen size. VitalPBX utilizes the latest technologies in Linux and Asterisk to provide a highly secure system on all levels. VitalPBX was forked from Ombutel preserving all the old features and adding more. Is it VitalPBX phone system really free? Yes, VitalPBX is free to use, including for commercial purposes. What license does VitalPBX have? VitalPBX software is offered with commercial license. It means you can use it for free, but not get the source code, make changes to it or reverse engineer it in any way.