Seems like a pretty easy thing to test, set it to go to sleep 5 minutes from now and stay asleep, then send it a fax 6 minutes later and see what it does, no sense looking all over for such a simple test.
I've looked all over but can't seem to find an answer to this question. If I set Energy Saver by schedule instead of activity, and allow it to take based on schedule instead of activity, will my WorkCentre 5955 queue up incoming faxes until it comes out of sleep mode or will it not answer incoming fax calls while asleep?