Paging people creates a series of problems unless you put enough resources to build a healthy “on-call” culture. Nobody wants to be buried into alerts or wake up at 2 am in the morning.
There are several points you have to take into account to make on-call suck less. At the center of each of these items, there are people. If you put your people at the center and design your incident response thinking about them in the first place, on-call becomes a competitive advantage.