Open source Voice quality Test tool

We are looking for an open source voice quality test tool. The tool should be able to measure the quality of voice (not just audio) on a call. Tool should also suggest the level of background noise and tell that quality of voice on call is good or below standard.

VoIP codec quality measurements are made by using a panel of human listeners. Overall quality is then calculated from these.

Apart from codec limitations, background noise is a function of the analogue part of the terminal equipment, not the VoIP system.

In particular see for the human testing that is done on VoIP codecs.