I work in an IT department as well, on call 24*7 365.
I am on salary so no extra written extra pay. If I do end up having to do something longer than say 15 mintues then I work out a TOIL day with my boss (normally a Friday).
I have a work notebook I have at perma home that I dont use it except for work. No other costs are covered. But I dont mind since the bonus last year was 27% of my yearly salary