  This work presents an analysis of the effect of the access router buffer size
on packet loss rate and how it can affect the QoS of multimedia services when
bursty traffic is present. VoIP traffic, real traces of viedoconferencing and
videosurvellance are used in two different scenarios with medium link
utilization. The study shows that the bursty nature of some applications may
impair the MOS of voice calls especially when a certain number of bursts
overlap. When link utilization is above 70% good values of VoIP QoS cannot be
obtained.
