The 'unavailable' canned greeting plays if an invalid/unrecorded greeting number is selected as the active greeting.

The mailbox user could have deleted a recorded greeting, or has selected an unrecorded greeting as his active greeting. Go to the mailbox and check the selcted active greeting number, then go to greeting management and play that greeting number to verify it has been recorded.

I have seen on a few occassions greetings 'disappear' but suspect the user has unknowingly changed a setting in their malbox.

Sometimes the thoughts in my head get so bored, they go for a stroll through my mouth. This is rarely a good thing.