Originator of the call release. Indicates the source of the call release as follows : 1) callingPartyInPstn : Calling party in PSTN. 2) callingPartyInVoip : Calling party in VoIP. 3) calledPartyInPstn : Called party in PSTN. 4) calledPartyInVoip : Called party in VoIP. 5) internalReleaseInPotsLeg : Due to an internal error in Telephony call leg. 6) internalReleaseInVoipLeg : Due to an internal error in VoIP call leg. 7) internalCallControlApp : Due to an internal error in Session Application or Tcl or VXML script originated release. 8) internalReleaseInVoipAAA : Due to an internal error in VoIP AAA module. 9) consoleCommand : Due to CLI or MML. 10) externalRadiusServer : Call failed during authorization , authentication or due to receipt of POD from the RADIUS server. 11) externalNmsApp : Due to SNMP request to clear the call. 12) externalCallControlAgent : External Call Control Agent initiated clear. 13) gatekeeper : Gatekeeper initiated clear due to receipt of Admission Reject, Disengage Request message. 14) externalGKTMPServer : External GKTMP server initiated clear due to receipt of Admission Reject message from the gatekeeper, triggered by RESPONSE.ARJ message from the GKTMP server.