Patent ID: 8270942

Claim:
A method for the interception of General Packet Radio Service (GPRS) control (GTP-C) messages, comprising: intercepting a GTP-C message at a control module, said control module configured to intercept GTP-C messages with one or more specified fields, states, addresses, or contexts and to ignore GTP-C messages with one or more of other specified fields, states, addresses, or contexts; said control module residing between a Serving GPRS Support Node (SGSN) and a Gateway GPRS Support Node (GGSN); performing a balance query to determine if a wireless subscriber device has a sufficient balance; forwarding said message from said control module to said GGSN if said wireless subscriber device has a sufficient balance; and, causing modification of said GTP-C message if said subscriber device has insufficient balance, wherein said modification comprises sending delete requests from said control module in the form of spoofed packets to each of the SGSN and the GGSN.