AT&T COMMUNICATIONS OF THE MIDWEST, INC., Appellant, vs. IOWA UTILITIES BOARD, Appellee, COON RAPIDS MUNICIPAL COMMUNICATIONS UTILITY; LAURENS MUNICIPAL BROADBAND COMMUNICATIONS UTILITY; FIBERCOMM, L.C.; FOREST CITY TELECOM, INC.; HEART OF IOWA COMMUNICATIONS, INC.; INDEPENDENT NETWORKS, L.C.; LOST NATION-ELWOOD TELEPHONE COMPANY; OFFICE OF CONSUMER ADVOCATE, A Division of the Iowa Department of Justice; GOLDFIELD ACCESS NETWORK, L.C.; and IOWA ASSOCIATION OF MUNICIPAL UTILITIES, Intervenors-Appellees.