I'm a network support engineer and data centre engineer. I get £200 before tax per week on call plus time and a half for the time I spent sorting the issue. Or double time on sun
We don't really deal with it on a 24/7 issue unless it's a major dc issue. Minor customer related issues are usually weekday evenings until about 7pm then working hours weekend. I have had a couple of serious issues that iv dealt with at night.