With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
callHistoryConnectTime
call History Connect Time
1.3.6.1.2.1.10.21.1.4.3.1.8
The value of sysUpTime when the call was connected.
Back to DIAL-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor callHistoryConnectTime on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.