VoIP Call Performance Over IPv6 During HTTP and Bittorrent Downloads.
Roman Yasinovskyy, Alexander L. Wijesinha, Ramesh K. Karne · 2009
We study the performance of a VoIP call in an IPv6 network during download of a large file using HTTP, BitTorrent, or uTP, and simultaneous downloads using HTTP and BitTorrent or HTTP and uTP. Performance metrics include maximum delta, maximum and mean jitter, throughput, packet loss, and perceived voice quality. The results indicate that the values of these metrics are stable and that call quality is not affected significantly by the background traffic. Performance over IPv6 and 6to4 is similar to performance over IPv4. In general, values of metrics indicate that voice quality is least affected by HTTP downloads, but BitTorrent downloads are likely to degrade voice quality more than uTP downloads. Transfer times for the file are highest for uTP over IPv6 and BitTorrent over 6to4. Bandwidth utilization patterns show that HTTP uses the available bandwidth more efficiently than BitTorrent and uTP, although uTP is better than BitTorrent.