With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvVrfInterfaceEntry
Cisco Voice Vrf Interface Entry
1.3.6.1.4.1.9.9.711.1.2.1.1
An entry in this table represents an interface to which a VRF is associated. A VRF can be associated to multiple interfaces. There will be one entry per interface for each VRF instance in this table.
Back to CISCO-VRF-MIB MIB page.
IPHost Network monitor allows you to monitor cvVrfInterfaceEntry 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.