Quality model for monitoring QoE in VoIP services

Abstract

This paper presents a no-reference model for monitoring the voice quality experienced by users in VoIP services. The proposed model is based on the E-Model, which is adapted from Recommendation ITU-T G.107 for this purpose. A calibration function was determined for relevant codecs under different packet loss conditions. Extensive field testing was carried out to validate the proposed model at PT Inovação Labs (Portugal). The results show that the mean opinion score (MOS) obtained from the proposed model match class C2 of conformance tests defined in ITU-T Recommendation P.564. The QoE model described in this paper was implemented in a VoIP QoE probe and is currently fully operational at Portugal Telecom.

Application of Quality of Experience in Networked Services: Review, Trend & Perspectives

“…Portugal Telecom implemented ArQoS® for collecting QoS information of network traffic and VoIP calls to assess QoE of VoIP services (Neves et al 2011). The operating system of the ArQoS® is based on two different modes, non-intrusive mode (passive system) and intrusive mode (active system) (Cardeal et al 2011).…”