Recently I got a good question from a coworker. He was working with a customer who was piloting Exchange Unified Messaging, and the customer was a little confused by a poorly-documented behavior of Exchange UM.
Consider that you have four test users who are UM-enabled: Alex, Brian, Carole, and David. You also have four users with Exchange mailboxes who are not UM-enabled: Magdalena, Nick, Oscar, and Pete.
However, he had Exchange configured to allow callers to leave voice mail messages without ringing the phone first (what I call “the coward setting”; it’s controlled with Set-UMDialPlan –SendVoiceMsgEnabled:$false). He was able to leave messages for Magdalena and the other non-UM-enabled users, which surprised him and generated the question.
This does seem odd. It’s easy to understand why you can leave a message for the first four users: they are UM-enabled, so they have extensions to which Exchange can transfer the call. But why can you leave a UM message for a user who isn’t UM-enabled? It’s because leaving a voice mail directly for a user doesn’t involve ringing an extension, so not having an extension assigned isn’t an obstacle. When you select that user for a message, UM will play the greeting (which is almost certainly going to be the system-generated TTS version of the user name, as a non-UM-enabled user probably will not have recorded a greeting) and record the message, then deliver it through the standard path.
The More You Know…