Non-intrusive Quality Monitoring Method of VoIP Speech Based on Network Performance Metrics

Masataka MASUDA
Takanori HAYASHI

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.2    pp.304-312
Publication Date: 2006/02/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.2.304
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Multimedia QoS Evaluation and Management Technologies)
quality,  VoIP,  non-intrusive,  VQmon,  PESQ,  E-model,  R value,  

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With the increasing demand for IP telephony services using Voice over IP (VoIP) technology, techniques for monitoring speech quality in actual networks are required to manage the quality of VoIP services constantly. Since the speech quality of VoIP is affected by IP network performance factors, non-intrusive methods of monitoring the quality of service (QoS) by passively measuring network performance are being watched with keen interest. VQmon technology is one of the non-intrusive quality monitoring methods. Although the monitoring functions of the VQmon for post-arrived packet behavior events at VoIP-gateways are effective, the estimating algorithm does not take differences in the implementations of VoIP-gateway products into account. We therefore propose a non-intrusive method of monitoring QoS that works in conjunction with ITU-T Recommendation P.862 "PESQ" that takes the characteristics of VoIP-gateway products into consideration. We compared the performance of non-intrusive quality monitoring technology such as VQmon and the proposed method in terms of estimating the accuracy of speech quality and mouth-to-ear delay. The experimental results revealed that the proposed method outperforms the conventional one, achieving sufficient accuracy for quality monitoring of VoIP services.