This python script can be used to trigger calls on a desk phone connected to a 3cx pbx.
To use, install the dependencies by using poetry or your favorite way of installing python packages.
You'll need "some recent" versions of websocket-client and requests.
Then, call the script by running PBX_URL=my3cxinstallation.my3cx.de python ./main.py $EXTENSION $PASSWORD $NUMBER_TO_CALL.
You can also move the script somewhere and place it in your $PATH to run it like helsinki-call-cli ....