With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
bstunGroupIndex
Cisco Blocked Serial Tunneling Group Index
1.3.6.1.4.1.9.9.35.1.2.1.1.1
The configured BSTUN group number. The significance of this number is that it must match the BSTUN group number configured in the router at the other end of the BSTUN tunnel.
Back to CISCO-BSTUN-MIB MIB page.
IPHost Network monitor allows you to monitor bstunGroupIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.