With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGtpHistRemotePort
Cisco GPRS Tunneling Protocol History Remote Port
1.3.6.1.4.1.9.9.188.1.3.5.1.4
This object indicates the port number for the remote end of the GTP path.
Back to CISCO-GTP-MIB MIB page.
IPHost Network monitor allows you to monitor cGtpHistRemotePort on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.