Only Mac and Windows OS are listed.
It’s a pain when Voip.ms account registration service disconnects.
I really like to stick to Linux - - and I never use Android either.
Stuck in “Old School Linux”
Couldn’t you basically just do the same thing they are doing with the mac option except using conky instead of geektool? It looks like it is just an api call via php.
If you can get the info as text, I can provide you with a conky that will display it (appearance, location and size all to your specs). Just let me know what your screen resolution is…