With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeEphoneRegState
Cisco Call Manager Express Ephone Registration State
1.3.6.1.4.1.9.9.439.1.2.6.1.2
The registration state of the Cisco IP phone. registered(1) - indicates the phone is active. unregistered(2) - indicates the connection to Cisco IP phone was closed in normal manner. deceased(3) - indicates the connection to the Cisco IP phone was closed because of a keep-alive timeout.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeEphoneRegState 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.