QoS testing is one of the key issues in modern telecommunications. Whether it is during the development of hardware, benchmarking of vendor equipment, setting up or operating a mobile network, there is always the problem of how to determine and optimize speech quality.

PESQ (according to the ITU-T specification P.862) is based on modelling of the human perception.
Polystar has worked together with a market leading telecom company to develop the Solver PESQ application.

Solver has the capability to perform PESQ measurements on several simultaneous calls at the same time as loading the SUT with heavy background traffic.

Solver takes an AMR coded voice sample and runs it through the SUT. When the sample is returned to Solver it is decoded and compared to the original, using the PESQ method described in the ITU specification mentioned above. The result is the PESQ score.

The PESQ score can be used to verify and compare voice quality for different system settings or architectures.

New functionality has been added to the PESQ application in Solver. It is now possible to do PESQ measurements between different interfaces and even between different types of networks, such as GSM, WCDMA and SIP. A great advantage is that you can do measurements and find problems even when calls passes different core network nodes and apply different codecs and speech rates. 

• Generates and receives mobile station calls through the circuit switched core network.
• Stores the received AMR coded voice.
• Decodes the received AMR “file” to WAV format.
• Performs PESQ calculations comparing the received speech with both the original and the AMR-coded original and presents the PESQ Score.