With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvpdnTunnelSessionDS1ChannelIndex
cvpdn Tunnel Session DS1 Channel Index
1.3.6.1.4.1.9.10.24.1.3.1.1.17
The DS1 database channel index if it is associated with this user session. Only a session over a device of type asyncInternalModem will have a valid value for this object.
Back to CISCO-VPDN-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor cvpdnTunnelSessionDS1ChannelIndex 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.