With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmPhoneIndex
Cisco Call Manager Phone Index
1.3.6.1.4.1.9.9.156.1.2.1.1.1
An arbitrary integer, selected by the local CUCM, which uniquely identifies a Phone within the CallManager.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmPhoneIndex 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.