There is new feature in CUC 11.0, not sure why you mentioned CUCM
Please go through below details.
Missed Call Notification
Missed call Alert feature allows the end user to receive the missed call alerts on email. The user has the option of either getting the missed call with summary notifications or receiving only the missed call alerts. For more information on default templates and settings for messaging assistant, see System Administration Guide for Cisco Unity Connection Release 11.x at
If CUCM is 9.x or higher version then CUC will not consume license for node.
End user will consume license for this feature.
With CUCM alone it is not possible as Amit already confirmed.