The Dialog_Failure_Event_Recv is issued from the state table to receive the ErrorCode when a dialog fails in an unrecoverable state.
It can be sent from the ICM to inform the state table of an error, for example, if the dialog has had a fatal failure. When the Dialog_Failure_Event_Recv is issued, the dialog is no longer active to the ICM.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.