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Amir Mehmood's Publications

Evaluation of VoIP Quality over the Pakistan Internet Exchange (PIE) Back Bone
Citation key MJS-EVOIPQPIEBB-05
Author Mehmood, Amir and Jadoon, Tariq and Sheikh, Noor
Title of Book ICET'05: Proceedings of the IEEE Symposium on Emerging Technologies, 2005
Pages 258–263
Year 2005
ISBN 0-7803-9247-7
DOI http://dx.doi.org/10.1109/ICET.2005.1558891
Location Islamabad, Pakistan
Month September
Abstract This paper assesses VoIP quality over the Pakistan Internet exchange (PIE) backbone between major cities of Pakistan. Passive measurements for voice calls in the presence of background Internet data traffic for different speech codecs such as the ITU-T G.711, G. 723.1 and G.729 were carried out. Interpacket delay and jitter were measured over the PIE IP/ATM backbone and the corresponding inter-packet delay densities were calculated for evaluating the perceptual quality of computer telephony calls using the ITU-T G. 107 E-model. The transmission quality (R-factor) and resultant mean opinion scores (MOS) were calculated for both backbone and access links of ISPs. The study highlights the growth of VoIP as a significant component of the PIE backbone traffic in Pakistan as well as reconfirms the presence of congestion hot spots in the access links.
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