With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccapAppTypeHisIPInCallDiscNormal
Cisco Call Applications Application Type History IP In Call Disconnected Normal
1.3.6.1.4.1.9.9.146.1.2.2.1.27
Total number of incoming IP call legs that disconnected with 'normal' cause code in this application type.
Back to CISCO-CALL-APPLICATION-MIB MIB page.
IPHost Network monitor allows you to monitor ccapAppTypeHisIPInCallDiscNormal on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.