With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeIntercomDnConfTable
Cisco Call Manager Express Intercom Dn Configuration Table
1.3.6.1.4.1.9.9.439.1.1.62
A list of intercom DN's (lines) configured on this device.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeIntercomDnConfTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.