With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvVoIPCallHistoryRemMediaIPAddr
Cisco Voice Vo IP Call History Remote Media IP Address
1.3.6.1.4.1.9.9.63.1.4.2.1.28
Remote media end point IP address for the VoIP call.
Back to CISCO-VOICE-DIAL-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor cvVoIPCallHistoryRemMediaIPAddr 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.