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Please note that:
A private branch exchange (PBX) is a telephone system within an enterprise that switches calls between users on local lines while enabling all users to share a certain number of external phone lines.
Asterisk is an open-source software implementation of a PBX.
FreePBX is a web-based open-source GUI (graphical user interface) that controls and manages Asterisk (PBX).
To set up a voice channel, you have two paths:
Further Information: