With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeEphoneCallLegs
Cisco Call Manager Express Ephone Call Legs
1.3.6.1.4.1.9.9.439.1.2.1
Indicates the active number of call legs contributed from the Cisco IP Phones and TAPI clients interacting with this device at this instance.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeEphoneCallLegs 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.