With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmPhoneTimeLastError
Cisco Call Manager Phone Time Last Error
1.3.6.1.4.1.9.9.156.1.2.1.1.12
The amount of time elapsed since the last phone error occurred. The reference point for this time is the time the last error occurred, as reported by the local CUCM.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmPhoneTimeLastError 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.