Adaptive VoIP playout scheduling: Assessing user satisfaction

Miroslaw Narbutt, Andrew Kelly, Philip Perry, Liam Murphy

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


Delay and packet loss dramatically affect the quality of voice-over-IP (VoIP) calls and depend on the playout buffer scheme implemented at the receiver. The choice of playout algorithm can't be based on statistical metrics without considering the perceived end-to-end conversational speech quality. The authors present a method for evaluating various playout algorithms that extends the E-model concept by estimating user satisfaction from time-varying transmission impairments. This article evaluates several playout algorithms and shows a correspondence between the authors' results and those obtained via statistical loss and delay metrics.

Original languageEnglish
Pages (from-to)28-34
Number of pages7
JournalIEEE Internet Computing
Issue number4
Publication statusPublished (in print/issue) - 1 Jul 2005


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