After a new implementation the customer began to experience dropped calls and an `all lines busy' error condition. The carrier confirmed their service was operational and all lines tested came back…

After a new implementation the customer began to experience dropped calls and an `all lines busy' error condition. The carrier confirmed their service was operational and all lines tested came back good. After contacting Avaya, support confirmed there were more calls being presented than the telephone switch could handle. Which pre-implementation step was omitted?