Ride any way you want but making an employee be on-call 24x7x365 is immoral. A company which does this is abusive. I would never allow an employeer to treat me unjustly like that.
My my manager once tried this. “We are a 24x7 shop” he said in a big meeting. I replied right to his face, “We are a 24x7 shop but I am not a 24x7 employee.”
-Tim-