A lot of times you hear, "or to leave a message in our general mailbox, press 9". My question is how do I setup a general mailbox with it's own greeting that will be the receptionist/operator's (301) duty to check? I would like that person to get the LED notification on her phone as well, just like she does when getting a message in her (301) mailbox.

In station config go to feature keys, choose which line key, for function type pick message center, pick extension not in use (example 320)
Go to dial action table 1 (this is usually default) choose what number you want to use, (any except 3) set the action as rec 1, set routing to what you defined in function key (example 320)

The line key you defined as the message center will flash when message is left.

Thanks, I set that up remotely and will confirm with client if that worked!