49 C.F.R. § 365.303 Contacting another party.
Title 49 - Transportation
When a person wishes to contact a party or serve a pleading or letter on that party, it shall do so through its representative. The phone and FAX numbers and address of applicant's representative shall be listed in the FMCSA Register.
Title 49: Transportation
PART 365—RULES GOVERNING APPLICATIONS FOR OPERATING AUTHORITY
Subpart C—General Rules Governing the Application Process
§ 365.303 Contacting another party.