With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoCallHistoryRetainTimer
cisco Call History Retain Timer
1.3.6.1.4.1.9.9.27.1.1.2
The minimum amount of time that an ciscoCallHistoryEntry will be maintained before being deleted. A value of 0 will prevent any history from being retained, but will not prevent callCompletion traps being genarated.
Back to CISCO-CALL-HISTORY-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoCallHistoryRetainTimer on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.