It appears as if you cant change the AA Alternate Greeting remotely.
An example would be if a business was closed due to snow and a manager wanted to call in and leave an alternate AA greeting that the office was closed for the day, but staff would be available via Cisco SBCS.
I called the main inbound number, got the AA, then tried #, *, 397, 398, 399.
Does this have to be configured first in some way? It does not seem intuitive.