@pip25 Yes you are, it might be an emergency. And saying you are busy takes 10 seconds at most (usually more like 3 - "I'm busy, is this an emergency?" "nop-" "bye-*beep*" is how it usually goes), and is overall far less intrusive than letting it continue ring. You could hang up manually, but at that point you are already holding your phone, in which case the 3 seconds to say you are busy and query if it is an emergency is only reasonable to spend for the what-if.