Advances in Electrical and Electronic Engineering (Jan 2014)

On-line Monitoring of VoIP Quality Using IPFIX

  • Petr Matousek,
  • Martin Kmet,
  • Martin Basel

DOI
https://doi.org/10.15598/aeee.v12i4.1203
Journal volume & issue
Vol. 12, no. 4
pp. 325 – 333

Abstract

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The main goal of VoIP services is to provide a reliable and high-quality voice transmission over packet networks. In order to prove the quality of VoIP transmission, several approaches were designed. In our approach, we are concerned about on-line monitoring of RTP and RTCP traffic. Based on these data, we are able to compute main VoIP quality metrics including jitter, delay, packet loss, and finally R-factor and MOS values. This technique of VoIP quality measuring can be directly incorporated into IPFIX monitoring framework where an IPFIX probe analyses RTP/RTCP packets, computes VoIP quality metrics, and adds these metrics into extended IPFIX flow records. Then, these extended data are stored in a central IPFIX monitoring system called collector where can be used for monitoring purposes. This paper presents a functional implementation of IPFIX plugin for VoIP quality measurement and compares the results with results obtained by other tools.

Keywords