With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccapAppTypeHisIPInCallDiscUsrErr
Cisco Call Applications Application Type History IP In Call Disconnected User Error
1.3.6.1.4.1.9.9.146.1.2.2.1.28
Total number of incoming IP call legs that disconnected with 'user error' cause code. User error cause code could be 'no answer/busy/timeout'.
Back to CISCO-CALL-APPLICATION-MIB MIB page.
IPHost Network monitor allows you to monitor ccapAppTypeHisIPInCallDiscUsrErr 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.