With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmiFaRegVisitorTimeRemaining
Cisco Mobile IP Foreign Agent Registration Visitor Time Remaining
1.3.6.1.4.1.9.9.174.1.1.1.2.1.6
The time remaining until the registration is expired. It has the same initial value as cmiFaRegVisitorTimeGranted, and is counted down by the foreign agent.
Back to CISCO-MOBILE-IP-MIB MIB page.
IPHost Network monitor allows you to monitor cmiFaRegVisitorTimeRemaining 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.