With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGgsnExtCallRateLastCollected
cisco Gateway GPRS Support Node Ext Call Rate Last Collected
1.3.6.1.4.1.9.9.647.1.1.15.1.2
This object indicates the time elapsed (in minutes) from the time when this data is collected and the time it is been retrieved.
Back to CISCO-GGSN-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cGgsnExtCallRateLastCollected 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.