With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgprsCgGroupIndex
Cisco GPRS Charging Group Index
1.3.6.1.4.1.9.9.192.1.1.60.1.1
A locally unique identifier for the charging groups on GGSN. Note: There is support for only 30 charging groups (0-29). Where charging group 0 is also referred as default charging gateway group.
Back to CISCO-GPRS-CHARGING-MIB MIB page.
IPHost Network monitor allows you to monitor cgprsCgGroupIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.