Abstract: In a first step a maximum waiting time corresponding to different worst cases at the node is computed, whereby the different worst case scenarios are dependent on the constellation of arrivals of packets of a number of active voice connections. In a next step a delay threshold for the maximum waiting time and a probability are defined. In a last step the bandwidth of the network node's output line is dimensioned in such a manner, that the delay threshold is not exceeded except in cases which occur as rare as the defined probability. Using this dimensioning concept, no packet has to wait more than the predefined delay threshold in most cases. Only in a few “unfortunate” cases, the threshold is exceeded and that happens with the defined probability and that is when more packets are present in the buffer of a network node than considered while dimensioning.