Project lead & developer
I've been contracting for a few years now, and so I'm usually working. But I still get sometimes dozens of emails a month, and even phone calls, often while I'm sitting at my desk and with my manager sitting right behind me.
'Availability is my solution to the wider problem. Recruiters need to find out who is available now, or at least, soon, for their clients, and contractors don't need to be bugged when they aren't looking.