> Doctors are one obvious example — they have on call responsibilities often more onerous than IT, and depending on the situation don’t always receive additional compensation for it.

My doctor (primary care physician) doesn’t work outside of business hours. In an emergency the recorded message says to call an ambulance and go to the emergency department at the hospital, which is staffed by a different set of people.

So it seems they do have at least some separation of the oncall aspect?

Lawyers are another story, there’s a lot of things wrong with that profession and we shouldn’t be trying to copy them.