Hello,
There is no real limit on the capacity of the Erlang traffic models. There is a limit of 180 channels on our free online calculators. This was introduced because the scripting language which they use (JavaScript) is very slow, and visitors were complaining that their PCs were locking up.
The Windows version, Westbay Traffic Calculators, does not have this limitation.
If you would like anymore information, please write to us.