There are a couple of vendors which have equipment for speech quality testing. I will mention QVoice by ASCOM and SwissQual (which are former employees of ASCOM as I know). In the ITU there are several standards for testing but in the end everithing is mapped to MOS (mean oppinion score) scale (bad, poor, fair, good, excellent). We are using QVoice and they have 3 different algorithms – PACE, PACE-TA and PESQ. They all map to MOS scale with certain probability.
If you need something more specific let me know.