Gx Interface

Gx interface is between the PCEF and PCRF.

Overview

Gx interface is between the PCEF and PCRF. It uses Diameter over TCP, UDP, SCTP transport protocol.

Network Diagram

Messages

  • Credit Control Requests/Answers Initial, Update and Terminate (CCR/A-I/U/T)
  • Reauthorization Requests/Answers (RAR/A)

Call Flows

Standards

  • 3GPP TS 23.203, TS 29.212 (Gx)
  • IETF RFC 6733, IETF RFC 3588, IETF RFC 5516 (Diameter)
  • IETF RFC 4960 (SCTP)
  • IETF RFC 793 (TCP)