What is GTP-C (GPRS Tunneling Protocol, Control Plane)?

The GTP tunnel comprises the GTP control plane (GTP-C) and GTP user plane (GTP-U). GTP-C is utilized for signaling between the gateway GPRS support node (GGSN) and the serving GPRS support node (SGSN). GTP-C executes signaling between the S-GW and P-GW in the core GPRS network to activate and deactivate endorser sessions, adjust the quality of administration boundaries.