With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cVideoCommonHistoryCallReferenceId
Cisco Video Common History Call Reference Id
1.3.6.1.4.1.9.9.753.1.1.1.1.2
The call reference ID associates the video call entry and voice call entry of the same endpoint. The call reference ID is assigned by the call manager and is non-zero for a video call session.
Back to CISCO-VIDEO-SESSION-MIB MIB page.
IPHost Network monitor allows you to monitor cVideoCommonHistoryCallReferenceId 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.