If you know how to configure call handlers and greetings that's all there is for almost any AA config you need.
AA answers the call and gives an option to dial a known extension or hold for the operator.
CTI RP with CFA to VM and matching call handler or call routing rules to reach right call handler
Caller holds for operator - Unity forwards call to CUCM built in Attendant console Pilot Point
Configure a separate call handler, under transfer settings set it to yes, ring subcriber at this extension: PP DN. On main call handler set the after greeting actions to Attempt transfer to: and use the previous call handler which has the PP DN configured under transfer.
Operator answers the call During normal working hours. Outside of normal hours call is diverted to a separate extension in a 24/7 manned control room.
Configure CUCM's TOD to achieve this. Working hours ring AC, after-hours configure a CTI RP with CFA to someone or use a translation pattern.
HTH
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HTH
java
if this helps, please rate