The voice mails won't be "lost". They'll still exist in the mailbox for 4001. If you change the extension to 4005 in CCM, you're going to need to make the change on the Profile page of the subscriber in Unity to 4005 as well. Otherwise, they're going to be sent to the wrong mail box.
There is a user account out in Active Directory, which is tied to their mailbox. When extensions are changed in Unity, this does not modify the location of their mailbox.
User A x4001 lets call him John, is changed to x4005 in BOTH CCM and in Unity. Unity will not allow duplicate extensions, so be aware that 4005 cannot belong to anyone else before assign it to John. It won't let you.
When John has his new 4005 extension in both Unity and CCM, he presses the voice mail button, Unity recognizes that 4005 is tied to John and sends him to his mailbox. Think of the extension as basically a logical mapping to the mailbox. Make sense?
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
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