Looked over promoting very capable employees.
Cannot use Skype to speak with teammates in between calls.
Adherence would get messed up if you had a long call, and you'd get coached for it.
Some very loud, obnoxious workers (throwing items from cubicle to cubicle, belching out loud) I once got hit with a small basketball while on a difficult call, good news is it disappeared after that event.
Loud break room.