All corporate operations expenses shall be apportioned among the interexchange category, the billing and collection category and all access elements in accordance with the Big 3 Expense Factor as defined in § 69.2(f) .
47 C.F.R. §69.409
All corporate operations expenses shall be apportioned among the interexchange category, the billing and collection category and all access elements in accordance with the Big 3 Expense Factor as defined in § 69.2(f) .
47 C.F.R. §69.409