Title :
Assessment of VoIP quality over access networks
Author :
Mehmood, M. Amir ; Jadoon, Tariq M. ; Sheikh, Noor M.
Author_Institution :
Inf. Technol. Infrastruct. Div., Pakistan Internet Exchange, Lahore
Abstract :
This paper assesses VoIP quality over access networks in Pakistan using a delay jitter measurement methodology for evaluating the perceptual quality of voice calls using the ITU-T G.107 speech quality E-model. Passive measurements for voice calls in the presence of background Internet data traffic for G.723.1 and G.729a codecs are carried out using a non-intrusive parametric model. The R-factor and resultant Mean Opinion Scores (MOS) were calculated at different link loads and congestion hot spots were identified. The study highlights the inadequacy of access networks for handling VoIP traffic at current in Pakistan and suggests alleviating congestion by increasing capacity in access networks
Keywords :
Internet telephony; delays; jitter; subscriber loops; vocoders; G.723.1 codec; G.729a codec; ITU-T G.107 speech quality E-model; Mean Opinion Scores; R-factor; VoIP quality assessment; VoIP traffic handling; access networks; background Internet data traffic; congestion hot spots; delay jitter measurement; link loads; nonintrusive parametric model; perceptual quality assessment; voice call passive measurements; voice call perceptual quality; Acoustic testing; IP networks; Internet telephony; Jitter; Parametric statistics; Propagation delay; Psychoacoustic models; Speech analysis; Telecommunication traffic; Traffic control; E-Model; Perceptual Quality Assessment; VoIP;
Conference_Titel :
Internet, 2005.The First IEEE and IFIP International Conference in Central Asia on
Conference_Location :
Bishkek
Print_ISBN :
0-7803-9179-9
DOI :
10.1109/CANET.2005.1598195
