Title 47 › Chapter CHAPTER 5— - WIRE OR RADIO COMMUNICATION › Subchapter SUBCHAPTER II— - COMMON CARRIERS › Part Part I— - Common Carrier Regulation › § 227b
The Federal Communications Commission (FCC) must make phone companies use the STIR/SHAKEN authentication system on their internet protocol (IP) phone networks within 18 months after December 30, 2019, and must require reasonable steps to authenticate calls on non‑IP networks. STIR/SHAKEN: a token-based way to check who is calling. Voice service: any phone service that connects to the public phone network and gives real‑time voice calling, including many internet‑based phone services and fax transmissions. The FCC must check within 12 months which providers already adopted or are ready to adopt these systems and send a report to the House Energy and Commerce Committee and the Senate Commerce, Science, and Transportation Committee. Every 3 years the FCC must review the technology and can change the rules if needed, and must report those findings. The FCC must look for hardships (for example, older equipment, small or rural providers) and can delay some providers when there is real difficulty, but delayed providers must still run robocall‑mitigation programs and can be forced to act if they keep originating large illegal robocall campaigns. The FCC must not let providers add extra line‑item charges for this authentication tech, must publish best practices within 12 months, and within 1 year must make rules about when calls may be blocked with no extra charge, provide a safe harbor for good‑faith blocking, set up a way for callers to prove their calls are real, and prevent unreasonable blocking of calls from providers granted delays. The FCC can also start other rulemakings as allowed by law.
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
Apr 6, 2026
Release point: 119-73