CUCM does not have this capability, if you forcefully need users to enter a pwd you'd need to look into MP or do some UCCX/UCCE scripting for this.
You can use Unity/CUC as a middle man so you can use a supervised transfer and then Unity will let you choose if you want to let someone in or send them to VM, but it won't ask for any passcode.
HTH
java
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate