An automatic message purge can be run daily without input from the administrator. A time for the automatic purge can be configured using Offline Configuration.
From the navigation tree, click Offline Configuration > Edit Offline Configuration. The Offline Configuration navigation tree opens.
When prompted to Duplicate Active Configuration, click Yes.
Click Auto Purge. The Auto Purge configuration screen is displayed.
In the Time to run purge field, select the hour at which you want to run the daily purge. By default, this value is set a 00 (midnight).
In the Delay after Message Waiting Off Request field, enter the amount of time to delay after the "message waiting off" request is sent. By default this value is set to 0. Enter any valid value between 0 and 50 (increments are .1 seconds so a setting of 10 = 1 second). Use this value when slower MWI methods like DMTF-to-PBX are used.
Click Save.
In the navigation tree, select Commit Changes and Exit. Confirm the commit. Your changes are now saved to the duplicate (inactive) configuration. Configuration changes will not take effect until you have activated the inactive configuration.