Gx Interface

Diameter load tester Gx interface test solution
4G Conformance
Gx Interface

Diameter load tester Gx interface test solution


Gx interface is between the PCEF and PCRF. The Gx interface test solution from Valid8 enables conformance or load testing of this interface,

What It Can Do For You

Tests the Gx interface.

Why It’s Different

  • Scalable software-based architecture can run on a range of hardware from COTS and high-end customer provided hardware to Virtual Machines and the Cloud (e.g. Amazon AWS) for maximum versatility and performance
  • Web-based UI is easy to learn
  • HTTP API enable integration with automation test systems and other equipment
  • Stateful modeling provides accurate emulation of network elements



  • Credit Control Requests/Answers Initial, Update and Terminate (CCR/A-I/U/T)
  • Abort Requests/Answers (ASR/A)
  • Reauthorization Requests/Answers (RAR/A)
  • Session Termination Request/Answers (STR/A)
  • Successful and Unsuccessful answers
Configurable Parameters
  • ‍Call session length
  • Concurrent calls/endpoints

Automation API

User commands can be fully automated using REST API. This includes performing all test control functions as well as collecting results and metrics.


The application’s subsystems can be edited directly in the browser using TDL or by using the graphical tools seen below. The Message Workshop allows for creating of test scenarios directly from the hex stream of a remote capture, while the Graphical Editor allows for creating customized call scenarios by dragging and dropping the call flow to meet your test needs.

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Use Cases

PCRF Under Test

For testing the PCRF, the 4G Network Emulator can wrap around the PCRF with the core network and IMS.

Supported Scenarios:
  • ‍CC-Request / Answer (CCR / CCA)
  • 4 Re-Auth-Request / Answer (RAR / RAA)
  • 4 Capability-Exchange-Request / Answer (CER / CEA)
  • 4 Session-Termination-Request / Answer (STR / STA)
  • 4 Abort-Termination-Request / Answer (ASR / ASA)
  • 4 Device-Watchdog-Request / Answer (DWR / DWA)
  • 4 Disconnect-Peer-Request / Answer (DPR / DPA)
  • ‍Emulates core network, Diameter, and IMS nodes as needed for testing the PCRF, exposing all internal interfaces
  • Conformance tests available for each interface (S7, S9, Rx, Gx)
Gx Interface
Gx Interface

Summary of Specifications


  • 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)

Product Details

Gx Interface

All Solutions

Valid8 exports its products strictly in accordance with all US Export Control laws and regulations which shall apply to any purchase or order. Specifications are subject to change without notice.

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Ordering Information

Product Name: Diameter Load Tester 

Product Code: diameter-load-tester

Datasheet Page

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4G Network Emulator
  • Product Name: 4G Network Emulator
  • Product Code: 4g-network-emulator
Datasheet Page