To insll FusionPBX on a Pi4 using Debian 10:
wget -O - https://raw.githubusercontent.com/fusionpbx/fusionpbx-install.sh/master/debian/pre-install.sh | sh;
wget -O - https://raw.githubusercontent.com/DigiDaz/FusionPBX-Pi4/master/pi-pre-install.sh | sh;
cd /usr/src/fusionpbx-install.sh/debian && ./install.sh