With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGtpRoamingTrustedPDPs
Cisco GPRS Tunneling Protocol Roaming Trusted PD Ps
1.3.6.1.4.1.9.9.188.1.3.4.1.42
This object indicates the number of roaming PDP contexts in a trusted PLMN.
Back to CISCO-GTP-MIB MIB page.
IPHost Network monitor allows you to monitor cGtpRoamingTrustedPDPs 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.