With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvCallHistorySessionTarget
Cisco Voice Call History Session Target
1.3.6.1.4.1.9.9.63.1.4.1.1.8
The object specifies the session target of the peer that is used for the call leg via telephony interface.
Back to CISCO-VOICE-DIAL-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor cvCallHistorySessionTarget 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.