Legislation was introduced in Australia to allow employees to protect themselves from unreasonable calls and emails from work during off-hours. You can read more about it, but a bill was passed to allow employees to ignore calls and messages without repercussion  It is expected to pass, though I don't expect this to do a lot for bad bosses. They'll find ways to hint or imply that you need to respond, and might even remove your chances of advancement/promotion/raises. While you can sue, that rarely works out well for anyone.

From the various reports I've seen, I'm not sure if this includes salaried workers or just hourly workers. I certainly think hourly workers ought to be paid if they're called after hours. I've even been paid as a salaried worker if the calls outside of core hours exceeded a certain amount per week. That seemed fair to me, and in our team, there was always someone willing to work more for extra money, so I could trade on-call work if I didn't want to do it.

Read the rest of Protecting Off Hours