I haven't traveled that much internationally, so I don't know if this is a standard feature in hotels in the UAE and elsewhere: mine had a doorbell. Ten minutes after I checked in, a houseboy rang the bell (it was loud enough to wake the dead) and asked me if I had any laundry for him. Thereafter, any housekeeping person would ring the bell before entering. If I could have disabled that doorbell, I would have. I jumped out of my skin every time they used it.