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The paper deals with the possibility of the Erlang B and Erlang C formula utilization in Next Generation Networks (NGN). Based on the common properties of synchronous and asynchronous networks it is possible the utilization of Erlang formulas also for asynchronous networks. It is possible to describe traffic in NGN networks by calculation of following parametersloss, link utilization and bandwidth. The second part of this paper deals with the possibility of application of Erlang B formula in contact center. Contact center is one of the many examples of the NGN networks. By application of Erlang B formula in contact center environment it is possible to monitor following important parametersnumber of agents, probability of call blocking, utilization of agents and mean number of calls in the system.

The paper analyses packet loss probabilities in network elements of VoIP networks. It utilizes statistical properties of classical telecommunication networks to derive proper characteristics of aggregated VoIP packet flow and to define mathematical model of network element queue. Finally model results are compared with simulation results for various traffic load levels.