47 CFR 1.718 : Telecommunication (§ 0.1 To Parts 401-499) — (§ 0.1 To § 19.735-203) — Federal Communications Commission (§ 0.1 To § 19.735-203) — General (§ 0.1 To § 19.735-203) — Practice And Procedure (§ 1.1 To Appendix C To Part 1) — Complaints, Applications, Tariffs, And Reports Involving Common Carriers (§ 1.701 To Subjgrp 182) — Informal Complaints (§ 1.716 To § 1.719) — Unsatisfied informal complaints; formal complaints relating back to the filing dates of informal complaints.

When an informal complaint has not been satisfied pursuant to § 1.717, the complainant may file a formal complaint with this Commission in the form specified in § 1.721. Such filing will be deemed to relate back to the filing date of the informal complaint: Provided, That the formal complaint: (a) Is filed within 6 months from the date of the carrier's report, (b) makes reference to the date of the informal complaint, and (c) is based on the same cause of action as the informal complaint. If no formal complaint is filed within the 6-month period, the complainant will be deemed to have abandoned the unsatisfied informal complaint.