With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeEMUserDirNumOverlay
Cisco Call Manager Express EM User Directory Number Overlay
1.3.6.1.4.1.9.9.439.1.1.68.1.4
This object indicates the overlay directory number configured for this line under this user profile.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeEMUserDirNumOverlay on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.