Is the Internet ready for VoIP? (2002) [4 citations — 1 self]
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author = {Fouad A. Tobagi and Athina P. Markopoulou and Mansour J. Karam},
title = {Is the Internet ready for VoIP?},
booktitle = {Proc. of IWDC},
year = {2002},
pages = {49--57},
publisher = {Microsoft Press}
}
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Abstract:
There is a great interest today in voice communication over the Internet (VoIP). If the Internet were to become the universal network for all communications needs, and thus were to displace the telephone network for voice communication, it must be capable of providing the same level of service quality as the telephone network. Today, this does not seem to be the case. VoIP is plagued with packet loss and variable packet delay in the network. Although measures are taken to overcome these problems (e.g., loss concealment and adaptive playout), their effectiveness is limited to certain ranges of network conditions. Thus it is of great importance to understand the packet loss and delay characteristics of today's Internet, in order to understand the effectiveness of the measures introduced to overcome the impairments. To that end, we examine in detail measurements of packet loss and delay taken over the Internet, and give a characterization thereof. We then comment on the impact that they can have on the quality of VoIP, and on the effectiveness of the measures introduced to minimize their impact. This study is limited to measurements taken only on Internet backbone networks, which represent important components in long distance communication. It reveals that packet loss and delay characteristics are not consistent across all backbone networks. Some backbone networks exhibit fairly good characteristics and may offer good quality communication, leading to a confirmation that packet voice is a sound approach. Other backbone networks exhibit undesirable characteristics that could not be accommodated with any of the measures introduced today. We comment on the possible causes and on the improvements that need to be made in the Internet backbone networks to render them adequate f...
Citations
| 160 | Adaptive playout mechanisms for packetized audio applications in wide-area networks – Ramjee, Kurose, et al. - 1994 |
| 104 | Packet audio playout delay adjustment: Performance bounds and algorithms – Moon, Kurose, et al. - 1998 |
| 56 | Analysis of measured single-hop delay from an operational backbone network – Papagiannaki, Moon, et al. - 2002 |
| 23 | Adaptive playout scheduling and loss concealment for voice communication over IP networks – Liang, Farber, et al. - 2003 |
| 4 | Speech quality of G.723.1 coding with added temporal discontinuity impairments – Voran - 2001 |
| 1 | Assessment of VoIP Quality over – Markopoulou, Tobagi, et al. - 2002 |
