Global hotkey for mute call
The key to mute and unmute should be a global key. As user, I do not want to search the window of the call to mute it.
Balazs Gabonyi commented
I totally agree as an ex-TeamSpeak user this was very useful while playing games (fighting bosses) that if you needed to cough, sneeze, or there was any unwanted noise in the background you could immediately reach for that hotkey without any conditions.
This used well can raise the quality and convenience of team cooperation a lot.
A small detail that is worth including as a feature.