You mentioned 10 minute intervals in your original post. Mitels have always repeated the WU at 5 minute intervals so I'm seriously wondering if this is related to Mitel WU at all.
:confused: If the call is answered, does it still repeat at 10 min. intervals? If not, it's an alarm call of some kind so it almost has to be from the voice mail and your customer originally described it as coming from the wake up "service". Why not find out what's heard when the call is answered and compare that to what you hear on a WU set by the console vs. a WU set by the voice mail.
And just for S&G, sign into box 317 and see if there's an uncanceled WU stuck on that mail box.
