With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeEMUserDirNumTag
Cisco Call Manager Express EM User Directory Number Tag
1.3.6.1.4.1.9.9.439.1.1.68.1.2
A number that uniquely identifies a directory number entry.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeEMUserDirNumTag 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.