RFC 8588 defines the SHAKEN attest claim with three values: A (full attestation of the calling identity), B (partial: the provider originated the call but cannot fully attest to the identity) and C (gateway: received from a gateway that does not support PASSporT or STI).
Checked 2026-09-30
- Vendor
- IETF
- Product
- SHAKEN PASSporT
- Subsystem
- attestation
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 8588
- Checked
- 2026-09-30
Sources
- RFC 8588: Personal Assertion Token (PaSSporT) Extension for Signature-based Handling of Asserted information using toKENs (SHAKEN) — IETF / RFC Editor · tier 1 standards and regulators · Sec. 4 attest claim
Cite this note
APA
WarmTransfer. (2026, September 30). Caller authentication and fraud prevention in contact centers: source note contact-center-caller-authentication-shaken-attest-levels. WarmTransfer. https://warmtransfer.net/knowledge/claims/contact-center-caller-authentication-shaken-attest-levels
BibTeX
@misc{warmtransfer-claim-contact-center-caller-authentication-shaken-attest-levels,
title = {Caller authentication and fraud prevention in contact centers: source note contact-center-caller-authentication-shaken-attest-levels},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/contact-center-caller-authentication-shaken-attest-levels},
note = {Source note contact-center-caller-authentication-shaken-attest-levels, checked 2026-09-30}
}