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Evaluating the Utility of Media–Dependent FEC in VoIP Flows

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Quality of Service in the Emerging Networking Panorama (WQoSR 2004, QofIS 2004, ICQT 2004)


In this paper, we present an analysis of the impact of using media–dependent Forward Error Correction (FEC) in VoIP flows over the Internet. This error correction mechanism consists of piggy-backing a compressed copy of the contents of packet n in packet n+i (i being variable), so as to mitigate the effect of network losses on the quality of the conversation. To evaluate the impact of this technique on the perceived quality, we propose a simple network model, and study different scenarios to see how the increase in load produced by FEC affects the network state. We then use a pseudo–subjective quality evaluation tool that we have recently developed in order to assess the effects of FEC and the affected network conditions on the quality as perceived by the end–user.

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Rubino, G., Varela, M. (2004). Evaluating the Utility of Media–Dependent FEC in VoIP Flows. In: Solé-Pareta, J., et al. Quality of Service in the Emerging Networking Panorama. WQoSR QofIS ICQT 2004 2004 2004. Lecture Notes in Computer Science, vol 3266. Springer, Berlin, Heidelberg.

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-23238-4

  • Online ISBN: 978-3-540-30193-6

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