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Reply To: Number of lines from Erlang B


Hi Damir,

The following is the estimated Erlang B Formual :

E= 1/ ( 1 + N/A + N(N-1)/A^2 + N(N-1)(N-2)/A^3 +… + N!/A^2)

Where E = Probability of Loss, N = Number of Trunks, and A= Carried Traffic.

Unfortunately, to calculate the number of lines, you will have to use the formula as is, and estimate the number of lines until E approximates your Loss Probability.