How do I best configure a "announcement only" mailbox?

We have a client with 2951 router with Cisco CME v8.x.  They need to have their receptionist be able to call in and change the school information message from an external number.  They told me that they used to be able to dial in on the main number and then push 1 to dial by extension. When they called into that extension they could push * and get into the mailbox and then access the prompt customization part of the AvT.  That isn't working and doesn't really make sense to me.  I have tried to dial by extension and dial the AvT extension and it says invalid number.  If I make the voicemail box for the extension in question an "announcement only" they cannot push * and change the greeting.  Is there a best way to configure this senario to make it easy for the receptionist to change the school information announcement from an external number?  Any help would be greatly appreciated!
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sr75Connect With a Mentor Commented:
AvT is the best way to get that to work.   I would check the config on both the CME and the CUE to ensure it is set up properly.  If it used to work, something changed that broke it.
DaveKall42Author Commented:
Is there a way to manage prompts with AvT when calling in from an outside number?  Would you know how that should be configured?  I cannot seem to figure out that would be configured?  I cannot seem to dial the "administration via telephone" number when calling in from outside.
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