CFR › Title 47 › Part 36 › §36.21547 CFR §36.215Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Directory revenues are assigned to the exchange operation.(b)Billing and collection revenues are assigned on the basis of services being provided.(c)All other revenues are apportioned on the basis of analysis.