It may not always be checked, so what we ask is that our case managers or others who go on leave say in their voice mail who they would be directed to follow up with. There are other contact numbers. That may include calling to our 1-800 NCCN number if they're going to be away for a period of time. It is possible that somebody who leaves unexpectedly and is away for a couple of days is not able to update it.
It certainly is, of course, our guidance and our training that people update their out-of-office information, be that email, phone or otherwise, to indicate who should be contacted in their absence.