The Wake-up Call feature can be used to schedule a Wake-Up Call.
There are two options available:
Enhanced Services → Wake-Up Call and
Enhanced Services → Operator Wake-Up Call.
*411 - dial this access code to set up a wake-up call for your extension and set your preferred time for the wake-up call. Once triggered and the user picks up the call, they can choose to cancel the wake-up call or snooze for 5,10 or 15 minutes.
*412 - operator will dial this code and then enter the extension number to set up the wake-up call for it.