[viraptor]

10% for each hour outside of standard work for being available. 2x base pay per each started hour during a callout.

I had different arrangements for this in previous jobs, but I think the availability pay + callout pay is a pretty fair way to deal with it.

In general though: I was always paid for on-call on top of the normal pay and likely wouldn't take it otherwise. (Unless it was explicitly added on top of normal comp of course) It's work and your time - that's mostly what the employer wants you for.