Not specifically software developers but several of the places I have worked at broke their on-call positions as follows Non-salaried -10% base pay differentia

Not specifically software developers but several of the places I have worked at broke their on-call positions as follows Non-salaried -10% base pay differential for on-call employees -2 rotating employees were scheduled at a time as first point of on call contact. This gives people a bit of buffer to plan their lives even though they are technically on call. -All time called in paid as over-time (1.5x base pay rate) Salaried -10% pay differential -For each on call hour worked, received 1 hour of vacation time. This kicked in after working more than 8 hours over their normal 80 hour pay period but applied to all hours worked. Kicked in immediately if they were called in on hours that were not pre-scheduled. Vacation time paid expired in 1 year and was paid out at 1x salary rate as of time of accrual if not taken. Some work environments and hours commanded additional pay bonuses. i.e. overnight work was paid at +15% of base. Most importantly, whatever you work out, run it by legal and HR to make sure you aren't violating any labor laws and make sure you don't abuse your employees.