A generalization of the Erlang’s B formula

In the present paper a generalization of the Erlang’s B formula is proposed, for a loss system in which arriving calls follow a Poisson process. The holding time of each call follows a negative exponential distribution. The application of the results obtained can be used for the improvement of the grade of service, the efficient use of the existing equipment and the appropriate tariff policy and technical planning of the networks. To evaluate the parameters included in the proposed generalized Erlang’s B formula real telex-data taken from the Salonica local area were used.