A realisitic VoIP traffic generation and evaluation tool for OMNeT++

The fraction of voice over Internet Protocol (VoIP) based telephone calls among the totality of voice based communication acts has been significantly growing during the last years. In wired, as well as wireless communication applications, VoIP is expected to completely replace former circuit switched telephony approaches, and is, thus, a major factor to be considered when designing sophisticated communication networks. The C++ based simulation library OMNeT++ has gained a lot of attention among the communication networks research community. It is being used as a design tool for next generation networks and their performance evaluation. In this paper, we present an OMNeT++ based VoIP traffic generator that creates realistic VoIP packet streams thanks to the utilization of real audio data and an existing VoIP standard codec. Moreover, by applying ITU-T’s perceptual evaluation of speech quality (PESQ) approach at the sink, the perceived quality of a transmitted VoIP stream can be determined. The process of creating, transmitting, receiving and evaluating VoIP streams is carefully explained. Some examples are presented and an exemplary quality evaluation is done.