Source note · STIR SHAKEN attestation framework
Cisco states that terminating service providers convey verification results in the verstat parameter of the SIP P-Asserted-Identity header, with 3 values: TN-Validation-Passed for a successful validation carrying an A, B or C attestation, TN-Validation-Failed where the caller could not be verified, and No-TN-Validation for a verification failure for other reasons such as a malformed E.164 number.
Checked 2026-09-16
- Vendor
- Cisco
- Product
- Webex Calling
- Subsystem
- STIR SHAKEN
- Deployment
- not restricted
- Region
- not restricted
- Release range
- not restricted
- Checked
- 2026-09-16
Sources
- Secure Calling and Spam mitigation — Cisco Systems, Inc. (help.webex.com) · tier 2 current vendor documentation · Understanding the STIR/SHAKEN standard, verstat options
Cite this note
APA
WarmTransfer. (2026, September 16). STIR SHAKEN attestation framework: source note shaken-verstat-carries-the-result-in-pai. WarmTransfer. https://warmtransfer.net/knowledge/claims/shaken-verstat-carries-the-result-in-pai
BibTeX
@misc{warmtransfer-claim-shaken-verstat-carries-the-result-in-pai,
title = {STIR SHAKEN attestation framework: source note shaken-verstat-carries-the-result-in-pai},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/shaken-verstat-carries-the-result-in-pai},
note = {Source note shaken-verstat-carries-the-result-in-pai, checked 2026-09-16}
}