We did not receive any missed calls in Exchange and voice mail. So, we asked, what did we do?
But, as a final user, we said we did not anything, but we did.
So, lets to the post!
When you have a production pool and you will create a new pool to another things, like migration, you can do it, but to have voice mail, you need re-run ExchUtil.ps1.
Bellow, lets see the log with Snooper.
The image bellow, show the UM IP gateway in Exchange Server 2013.
Check, if the new pool is showed in Exchange Server 2013.