Should a straight on & off do the trick or should I try off, wait a minute, and back on ??
Flick it off and on, quickly.
If that doesn't work, switch it off, wait a few seconds, then turn it back on.
If that doesn't work, unplug the headset and plug it back in.
If that doesn't work, do the same but with a pause before re-plugging.
If that doesn't work... I'll be confused (not an uncommon state, I might add).
good luck!