Official US Government Resources
The authoritative .gov sources behind every rule on this site — the FCC, FTC, the US Code, the CFR, and more. When a vendor doc and a government source disagree, the government source wins.
This page collects the primary government sources for US A2P texting and calling. Industry and vendor documentation (Twilio, Telnyx, TCR, CTIA, etc.) is useful for how-to, but it is secondary. For what the law actually requires, go to the source.
Federal Communications Commission (FCC)
The FCC enforces the TCPA , mandates STIR/SHAKEN caller-ID authentication, and operates the RMD .
| Resource | What it covers | Official link |
|---|---|---|
| FCC — home | The regulator for US telecom | https://www.fcc.gov/ |
| Telemarketing & robocalls | Consumer-facing TCPA / robocall rules | https://www.fcc.gov/general/telemarketing-and-robocalls |
| Call authentication (STIR/SHAKEN) | Caller-ID authentication framework & mandates | https://www.fcc.gov/call-authentication |
| Robocall Mitigation Database | Where voice providers certify mitigation | https://www.fcc.gov/robocall-mitigation-database |
| Stop unwanted robocalls & texts | Official consumer guidance | https://www.fcc.gov/consumers/guides/stop-unwanted-robocalls-and-texts |
| FCC consumer complaint center | Where consumers report violations | https://consumercomplaints.fcc.gov/ |
Federal Trade Commission (FTC)
The FTC enforces the Telemarketing Sales Rule (TSR), runs the National Do Not Call Registry, and publishes business compliance guidance (including CAN-SPAM).
| Resource | What it covers | Official link |
|---|---|---|
| FTC — business guidance | Compliance guidance for businesses | https://www.ftc.gov/business-guidance |
| Telemarketing Sales Rule | The TSR (16 CFR Part 310) | https://www.ftc.gov/legal-library/browse/rules/telemarketing-sales-rule |
| National Do Not Call Registry | Register / verify / report (consumers & sellers) | https://www.donotcall.gov/ |
| Complying with the Telemarketing Sales Rule | Plain-language FTC compliance guide | https://www.ftc.gov/business-guidance/resources/complying-telemarketing-sales-rule |
Statutes & regulations (the actual law)
| Authority | Citation | Official link |
|---|---|---|
| Telephone Consumer Protection Act | 47 U.S.C. § 227 | https://uscode.house.gov/view.xhtml?req=(title:47%20section:227) |
| TCPA implementing rules | 47 CFR § 64.1200 | https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-64/subpart-L/section-64.1200 |
| Electronic Code of Federal Regulations | eCFR (browse all current rules) | https://www.ecfr.gov/ |
| Federal Register | Proposed & final rulemakings, comment dockets | https://www.federalregister.gov/agencies/federal-communications-commission |
| TRACED Act (2019) | Pallone–Thune TRACED Act, S.151 | https://www.congress.gov/bill/116th-congress/senate-bill/151 |
Other official resources
| Resource | What it covers | Official link |
|---|---|---|
| IRS — Apply for an EIN | The Employer Identification Number you register with | https://www.irs.gov/businesses/small-businesses-self-employed/apply-for-an-employer-identification-number-ein-online |
| IRS — Tax Exempt Organization Search | Verify 501(c)(3) status for charity messaging | https://www.irs.gov/charities-non-profits/tax-exempt-organization-search |
| USTelecom — Industry Traceback Group | FCC-designated traceback consortium under the TRACED Act | https://ustelecom.org/industry-traceback-group/ |
site:fcc.gov call authentication) rather than trusting a cached third-party copy.Looking for the dated history of what changed? See the regulatory change tracker.