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Asterisk is a software implementation of a private branch exchange (PBX). In conjunction with suitable telephony hardware in-
terfaces and network applications, Asterisk is used to establish and control. https://www.asterisk.org/

FreePBX is a 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.

Other information

https://www.voipsupply.com/voip-phone-system-overview
https://business.panasonic.co.uk/communication-solutions/introduction-to-voip

https://www.youtube.com/watch?v=jxTMZ22K0zE

Our thanks to Alan for another informative presentation.

Dave Robb