Twinkle: Mark window as "demands attention" or show a text notification on incoming call
Mark window as "demands attention"
Install wmctrl through your package manager, i.e.
sudo apt-get install wmctrl
Download the attached script and mark it as executable.
Then go to Edit -> User Profile -> Scripts and add the script for "call incoming".
Text notification
You can additionally get a notification bubble in your window manager, by adding
notify-send "Eingehender Anruf..."
to the script.
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