I have a device called an Ambery IP-P4 (Older version no longer sold) that had a bad power supply and was e-wasted.
Turns out the power supply is easily replaced (internal) as I am an Electronics Telecomm. Engineer.
I have modified it to work on 12 volts instead for my customized system Battery Backed-Up / 12 volt power system at this link. Just haven’t installed it yet but will soon.
This unit allows access via IP and if IP is down via Telephone (POTS) line to control 4 relays using Touch-Tones.
My setup is not for your average user, this is a Advanced user setup…