Media Gateway Testing

3GPP R5/R4 - NGN Media Gateways - The Key to Convergence

Making Convergence Happen

Convergence is the big news item in communication technology these days and given its impact on network capabilities, it's no wonder.  Enabling the transport of various types of payload over the same network, including voice, video, music and any kind of data service, Convergence literally heralds a new communications era.

To accommodate the requirements of a common network for all service types, Convergence has been made possible with the introduction of new types of network elements:

  • Media Gateway (MGW):  This new core network element is in charge of handling all the payload.
  • Media Gateway Controller (MGC): This new core network element is in charge of controlling the MGW, while handling all signaling information.

In a converged network, the Media Gateway is in charge of converting the various payload types into a common readable format.

Media Gateway testing may address the following issues:

  • Interworking:  Does the MGW handle different types of user-plane interfaces and various payload formats correctly? 
  • Speech path & voice channel testing: Does the MGW correctly switch / route the voice channels between different interfaces and applications?
  • Voice quality Analysis:  Is the quality of the voice patterns affected when the payload needs to be converted with different compression algorithms?
  • Codecs - TFO / TrFO operations:  Does the MGW correctly handle the various codecs (e.g., AMR, GSM-EFR / FR, G.72x) requested by different applications? Can the MGW correctly handle the TFO/TrFO operations as necessary?
  • Robustness / Stability verification:  In order to ensure that the MGW can handle real traffic deployed in the live network, extensive load testing must be undertaken to ensure adequate robustness and stability of the Media Gateway.

The Nexus8610 Traffic Simulation System offers a comprehensive set of features and testing functionality for MGW testing: 

  • Interworking testing by simulating all relevant interfaces, including UMTS, GSM, SIP/RTP and a wide range of PSTN flavors
  • Sending tone and voice patterns (wave files) or DTMF digits for speech path and voice channel verification, including various types of codecs  (e.g., G.711, G.729, AMR, GSM.EFR, GSM-FR)
  • Voice Quality Analysis per PAMS, PSQM (G.761) and PESQ (G.762) algorithms
  • Powerful and flexible scripting to test all features and functionality of the Media Gateway
  • "Ready to go" test cases for all applications
  • Robustness and Stability testing to assure carrier-grade quality, optionally supported by Test Automation for 24 x 7 fully automated testing