The quality of multiple VoIP calls in an encrypted wireless network

We quantified the user-perceived quality for a VoIP application running in an encrypted wireless network and we experimentally determined the maximum number of parallel VoIP calls that can be achieved, at the best quality of the speech signal. We studied the behaviour of the application for four encryption mechanisms and for each of them we measured the bandwidth waste due to encryption. We used the ITU-T PESQ score to objectively assess the quality of the speech signal. In this paper we present the test setup and the tools we used for our experiments, as well as our experimental results and conclusions.