The server must be installed on the 3CX PBX PC
3CX is a windows-based telephone system. It uses third party SIP handsets or softphones as end points.
Firmware Requirements (for new installations):
R12 - New installation R14 and R15
R15.5 supported on windows servers, not supported on Linux servers.
A licensed PBX is required. The "Free" license is not supported,