The traffic characterization of adaptive real-time applicationsprovides a challenging engineering task of the current Internet.Here the arrival and packet length processes arising fromaunidirectional VoIP flow of Skypepackets are investigated bystatistical means. Themeantraffic load offered by the packetflow to a virtual link of limited capacity in a finite observationperiod is calculated andthe mean and upper bounds for the time without loss are derived.A possible characterizationof the packet arrival process by aproperly chosen non-linear GARCH(1,1) model is presented.
