I recently escaped a situation sort of like the one you describe. 5 desk smallish office, we had one coworker who already has a very high natural voice volume

I recently escaped a situation sort of like the one you describe. 5 desk smallish office, we had one coworker who already has a very high natural voice volume and tone, who could not be stopped from having all sorts of personal calls while at the desk. Boss would do nothing (but was closing his office door not to hear him) since he was a pathological submissive introvert. We asked politely to at least leave the room. We asked not so politely. We had the office manager come and talk to him, the quiet would last two or three days and then it will all start again. Calling his spouse, calling his kids and doing homework with them at the phone, calling his parents, mechanic, house renovator and whatnot. We started counting and averaged around 7 calls a day, which we could not avoid to hear. In 2018 the total was around 1800 calls.