Normally you would just have the dialed number go to a cti route point forwarding over to Unity/UConn. Have a call handler setup with the desired message as a standard greeting with no input allowed and then have it ring out to whatever extension you want.
Set the schedule on the handler and have no messages for the closed greeting.
Another option is to perform the time of day check on CUCM and then route it accordingly to either UCCX or voicemail system, this way you do not have to waste ports during the time you do not need to play the message.
If you have Unity or Unity Connection send it through call handler as suggested by Gregory (+5 points). If you want to keep it simple setup schedule in Unity, to make it more efficient setup time of day routing in CUCM.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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