47 C.F.R. § 69.403
Marketing expense (Account 6610)
Marketing expense shall be apportioned among the interexchange category and all access elements in the same proportions as the combined investment that is apportioned pursuant to § 69.309.
Marketing expense shall be apportioned among the interexchange category and all access elements in the same proportions as the combined investment that is apportioned pursuant to § 69.309.