With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGtpMaximumPdps
Cisco GPRS Tunneling Protocol Maximum Pdps
1.3.6.1.4.1.9.9.188.1.1.10
The maximum number of PDP contexts that can be activated on the GSN.
Back to CISCO-GTP-MIB MIB page.
IPHost Network monitor allows you to monitor cGtpMaximumPdps 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.