Thanks for that. Let me try to put it again what i understood from ur explaination.
GOS is just a statistical figure. Erlang-B just says that GOS will be as low as 2% with offering 99 carriers and when my traffic load on an average is 87erl.
If my traffic load is higher than 87erl ,setup failure is MORE LIKELY to happen than when my traffic load was 87erl or less.
It does not necessarily mean there has to be more setup faillures but it just means that the probability or chance of setup failure rises.
I guess i got it right this time…