With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGgsnExtSubscriberMnc
cisco Gateway GPRS Support Node Ext Subscriber Mnc
1.3.6.1.4.1.9.9.647.1.5.2
MNC value of the subscriber, for which trace activation failure has occured.
Back to CISCO-GGSN-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cGgsnExtSubscriberMnc on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.