With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGgsnExtCallRateHistory
cisco Gateway GPRS Support Node Ext Call Rate History
1.3.6.1.4.1.9.9.647.1.2.6
This object specifies the number of callrate history be maintained in the cGgsnExtHistCallRateStatsTable.
Back to CISCO-GGSN-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cGgsnExtCallRateHistory 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.