Deutsche Telekom’s All-IP consumer connections hand you SIP credentials for your landline numbers, and you are free to use them with your own equipment. I bought some VoIP desk phones recently and configured our landline with a self-hosted Asterisk PBX on a Raspberry Pi 4 running OpenWrt (see Router).
I’m working at a software company. One of our side projects is the integration of new control concepts and input devices to robotic control.
We’ve integrated a couple of input devices and can control different rovers. One of them is the one I built.
While browsing for different breakout boards for the Rover I’ve discovered a nice little board that has a push button and logic pin to control a MOSFET.
This little contraption allows switching on and off the power, say through a USB cable.