I’m looking for a way to disable incoming calls when user is on a call.
Searching the archives, I’ve found that adding this line:

to the configuration file (win: %APPDATA%\Jitsi)

Should do the trick.

But it doesn’t.
I tried restarting Jitsi, and also the pc but still I get sound notification while I’m on a call with someone else.

Is there something I need to do to apply this change?
Has the configuration key for this changes?