With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
Cisco Call History Disconnect Text
ASCII text describing the reason for call termination. This object exists because it would be impossible for a management station to store all possible cause values for all types of interfaces. It should be used only if a management station is unable to decode the value of dialCtlPeerStatsLastDisconnectCause.
Back to CISCO-DIAL-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor cCallHistoryDisconnectText on Cisco device via the SNMP protocol.
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Easy monitoring of cCallHistoryDisconnectText with IPHost tools