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You can specify a time to schedule auto logoff of ALL users having 'auto logoff' permission.
Permission settings
Via sipXconfig: Users -> Users -> user id -> permissions the hotdesking permissions can be selected. Currently there are three of them:
hotdesking, is user allowed to use hotdesking
hotdesking_without_pincode, skip pincode prompt for this user
hotdesking_auto_logoff, is this user allowed to be automatically logged off by the 'auto logoff time trigger'.