47 CFR § 3.43 - Applicable rules and regulations.
Accounting authority operations must be conducted in accordance with applicable FCC rules and regulations, the International Telecommunication Regulations (ITR), and other international rules, regulations, agreements, and, where appropriate, ITU-T Recommendations. In particular, the following must be adhered to or taken into account in the case of ITU-T.
(a) The latest basic treaty instrument(s) of the International Telecommunication Union (ITU);
(b) Binding agreements contained in the Final Acts of World Administrative Radio Conferences and/or World International Telecommunication Conferences;
(c) ITU Radio Regulations;
(d) ITU International Telecommunication Regulations (ITR);
(e) ITU-T Recommendations (particularly D.90 and D.195); and
(f) FCC Rules and Regulations (47 CFR part 3).