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Accuracy analysis on call quality assessments in voice over IP

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Show simple item record Han, Yi Fitzpatrick, John Murphy, Liam Dunne, Jonathan 2013-07-10T15:38:02Z 2013-07-10T15:38:02Z 2013
dc.description peer-reviewed en_US
dc.description.abstract Voice over IP (VoIP) now has tremendous influence on the telecommunication market with its flexibility and price advantage. Users of VoIP expect call quality to be as good as, if not better than the traditional Public Switched Telephone Network (PSTN). However in VoIP, factors that are related to the IP transport network such as packet loss, delay, bandwidth, jitter, and voice encoding (codec) all affect call quality. Call quality assessment in VoIP systems is mainly conducted with off-line tests using the Perceptual Evaluation of Speech Quality (PESQ) [1] methodology. Another method that can be utilised is an on-line approach using the E-Model, which can be used in real time. However, these two methods have limits and inaccuracy, and often do not give the same results. Call quality assessment is often used to adjust system and codec parameters. Therefore, given inaccurate results, the system would decrease the adjustment efficiency or even inadvertently decrease call quality. The primary contribution of this paper is a comparison between the accuracy of PESQ and the E-Model investigated by conducting an extensive set of experiments in a real enterprise network using a widely deployed Voice over IP (VoIP) product. Experiments were conducted under varying controlled network conditions. The results show that under various conditions, loss rates, codecs and across a range of languages that there can be significant differences between the call quality measurement obtained when using the E-model versus a PESQ analysis en_US
dc.language.iso eng en_US
dc.publisher IEEE Computer Society en_US
dc.relation Marie Curie actions en_US
dc.relation.ispartofseries the 6th Joint IFIP Wireless and Mobile Networking Conference (WMNC’2013);pp. 1-7
dc.rights “© 2013 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.” en_US
dc.subject voice over en_US
dc.subject IP en_US
dc.subject PESQ en_US
dc.subject E-MOdel en_US
dc.subject call quality en_US
dc.title Accuracy analysis on call quality assessments in voice over IP en_US
dc.type info:eu-repo/semantics/conferenceObject en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.contributor.sponsor SFI en_US
dc.contributor.sponsor IRCSET en_US
dc.contributor.sponsor HEA en_US
dc.relation.projectid 08/SRC/I1403 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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