With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeEMUserDirNum
Cisco Call Manager Express EM User Directory Number
1.3.6.1.4.1.9.9.439.1.1.68.1.3
This object indicates the E.164 phone diretory or extension number which is downloaded to a line on the extension mobility phone when an user logs into it.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeEMUserDirNum on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.