The Cause code of the failure. This cause is derived from a monitoring thread in the CallManager or from a heartbeat monitoring process. unknown: Unknown heartBeatStopped: The CallManager stops generating a heartbeat routerThreadDied: The CallManager detects the death of the router thread timerThreadDied: The CallManager detects the death of the timer thread criticalThreadDied: The CallManager detects the death of one of its critical threads deviceMgrInitFailed: The CallManager fails to start its device manager subsystem digitAnalysisInitFailed: The CallManager fails to start its digit analysis subsystem callControlInitFailed: The CallManager fails to start its call control subsystem linkMgrInitFailed: The CallManager fails to start its link manager subsystem dbMgrInitFailed: The CallManager fails to start its database manager subsystem msgTranslatorInitFailed: The CallManager fails to start its message translation manager subsystem suppServicesInitFailed: The CallManager fails to start its supplementary services subsystem.