Title 47 › CHAPTER 5 — WIRE OR RADIO COMMUNICATION › SUBCHAPTER II — COMMON CARRIERS › Part I — Common Carrier Regulation › § 227b
The FCC must require phone companies to use the STIR/SHAKEN caller ID verification system on their internet-protocol (IP) networks within 18 months after December 30, 2019, and to take reasonable steps to use good caller-ID checks on non‑IP networks. STIR/SHAKEN is an industry standard for securely verifying who is calling. Voice service means any service that connects to the public telephone network to give voice calls, including faxes and real‑time Internet‑based voice services like VoIP. The FCC must check within 12 months after December 30, 2019 whether providers have adopted, started, or agreed to use these systems and must send a report to Congress. Every 3 years starting 3 years after December 30, 2019, the FCC must review the technology and can change it if needed, and report on that. The FCC must also study implementation burdens (especially for small, rural, or older networks) and may delay deadlines for providers facing undue hardship. If a delay is given because non‑IP protocols aren’t ready, providers must run robocall‑blocking programs until they can authenticate calls. The FCC must forbid extra line‑item charges to consumers or small businesses for these authentication tools and must issue best practices and rules (within 1 year after December 30, 2019) on blocking calls, a safe harbor from liability for mistaken blocks, a way for callers to verify their calls, and protections so calls from delayed areas are not unreasonably blocked. The FCC must consider how well providers used the authentication info and whether they took care to avoid blocking emergency calls.
Full Legal Text
Telegraphs, Telephones, and Radiotelegraphs, Source: USLM XML via OLRC
Legislative History
Reference
Citation
47 U.S.C. § 227b
Title 47, Telegraphs, Telephones, and Radiotelegraphs
Last Updated
Sep 22, 2026
Release point: 119-110