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In recent years the interest in supporting Voice over IP (VoIP) services over Wireless Local Area Networks (WLANs) based on IEEE 802.11 standard is growing. A key issue on this paper is to understand how well the 802.11 can support Quality of Service (QoS) for VoIP services. Recently ITU-T has released the E-Model recommendation to evaluate voice quality perceived by users. In this paper, the authors present via experimental trials with commercial equipments, the relationship between the E-Model and network metrics like packet, delay, jitter and packet loss in order to find the optimal working point for a WLAN supporting VoIP applications.
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