With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
xdsl2LineFallbackGroup
xdsl2 Line Fallback Group
1.3.6.1.4.1.2011.2.25.251.2.1.2
The group of configuration, status, and commands objects on the line level that are associated with the fallback feature.
Back to VDSL2-LINE-MIB MIB page.
IPHost Network monitor allows you to monitor xdsl2LineFallbackGroup 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.