Erlang C - technical definition

A traffic engineering model that assumes that calls encountering blockage are queued indefinitely until a circuit is available, with no overflow to more expensive circuits. Erlang C commonly is used to engineer circuit requirements for automatic call distributors (ACDs) in incoming call centers. See also Erlang, Erlang C, Equivalent Queue Extended Erlang B, Extended Erlang B, GoS, Poisson distribution, traffic, and traffic engineering.