With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmPhoneFailCauseCode
Cisco Call Manager Phone Fail Cause Code
1.3.6.1.4.1.9.9.156.1.2.3.1.6
States the reason for the phone device communication error.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmPhoneFailCauseCode on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.