The Dialog_Failure_Event_Send is issued from the state table to report a dialog failure that is in an unrecoverable state.
It can be sent from the state table to inform the ICM of an error, for example, if the dialog has had a fatal failure. When the Dialog_Failure_Event_Send is issued, the dialog is no longer active to the ICM. The dialog is still available to the VRU so that any signaled events can be retrieved by the state table.