Blocking probability is the probability that a caller will have a call not connect because all lines are busy. What do they mean by Number of Lines and Traffic? Do you put number of circuits in service as the number of lines? Traffic looks like time connected average multiplied by the number of calls in a period of time. What is the period of time? Where would you get this traffic number? Is this your busy hour ccs? It is not clear to me where you get the numbers to plug into an erlangb formula…