With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmPhoneInfoGroupRev3
Cisco Call Manager Phone Info Group Rev3
1.3.6.1.4.1.9.9.156.3.2.24
A collection of objects which provide info about all phones within the scope of the local CallManager. It comprises of the Phone and Phone Extension tables.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmPhoneInfoGroupRev3 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.
