With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvVoIPCallActiveTable
Cisco Voice Vo IP Call Active Table
1.3.6.1.4.1.9.9.63.1.3.2
This table is the VoIP extension to the call active table of IETF Dial Control MIB. It contains VoIP call leg information about specific VoIP call destination and the selected QoS for the call leg.
Back to CISCO-VOICE-DIAL-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor cvVoIPCallActiveTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.