The FCC states that A- and B-level attestation both require confirming a direct authenticated relationship with the customer, which a third party with no relationship to that customer cannot determine.
Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- FCC third-party authentication rule
- Deployment
- carrier
- Region
- us
- Release range
- effective 2025-09-18
- Checked
- 2026-10-02
Sources
- Call Authentication Trust Anchor (Federal Register 2025-15809; FCC 24-120) — Office of the Federal Register via GovInfo · tier 1 standards and regulators · 90 FR 40245
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting STIR/SHAKEN attestation levels on outbound calls: source note stir-shaken-attestation-troubleshooting-tp-direct-relation. WarmTransfer. https://warmtransfer.net/knowledge/claims/stir-shaken-attestation-troubleshooting-tp-direct-relation
BibTeX
@misc{warmtransfer-claim-stir-shaken-attestation-troubleshooting-tp-direct-relation,
title = {Troubleshooting STIR/SHAKEN attestation levels on outbound calls: source note stir-shaken-attestation-troubleshooting-tp-direct-relation},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/stir-shaken-attestation-troubleshooting-tp-direct-relation},
note = {Source note stir-shaken-attestation-troubleshooting-tp-direct-relation, checked 2026-10-02}
}