The call routing table with a bus sched that is blank for all entries assumes that the voicemail is in night mode at all times.
Internally routed calls from subscriber to Annie answer normally because they are not subject to business hours.
Your TG5 Day incoming destination is 4331, what is that, LDN, the operator? Also what type of trunking do you have?
Your night destination is 4501, The AA will answer as 4501 whenever a call is directed to it, if the night destination in the TG 5 is 4501 and is enabled by the operator activating the night-service button, then the switch sends a message as a night-mode trunk level call to Annie and she should respond with the greeting and routing defined in 4501.
I am confused by your 7 digit number (9879853) in AA routing table, your dial plan is apparently 4 digits. Annie wouldn't have a match to respond in any case here, she does not route calls from TG names, she routes calls based on information contained in the DCIU messaging.
This messaging is similar in nature to what a mode-code machine sends, but in your case it it is sent "out-of-band" on the link.