How To Install Asterisk 16 LTS on Debian 11.3

Asterisk is a complete telephony server that delivers Private Branch Exchange (PBX), Interactive Voice Response (IVR), Automated Call Distribution (ACD), Voice over IP (VoIP) gatewaying, Conferencing, and a wide variety of additional telephony applications to a broad range of telephony devices such as packet voice devices.
For more explanation on this video: https://www.linuxhelp.com/how-to-install-asterisk-16-lts-on-debian-11-3