Initial values of trunk blocking probability d=0 Calculate offered load for each trunk Calculate blocking probability Steady state for each trunk probabiliti Converge or not No YES d+1 d=D or not? YES Network blocking probability20 d=0 Calculate offered load for each trunk Calculate blocking probability for each trunk Converge or not? d+1 YES No Steady state probabilities Initial values of trunk blocking probability Network blocking probability d=D or not? No YES