Source note · Troubleshooting SIP 403 Forbidden from a carrier
RFC 8224 defines 436 Bad Identity Info as indicating that the verification service could not acquire the credentials needed to validate the signature in an Identity header field.
Checked 2026-09-30
- Vendor
- IETF
- Product
- STIR
- Subsystem
- verification service
- Deployment
- any
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- RFC 8224: Authenticated Identity Management in the Session Initiation Protocol (SIP) — IETF / RFC Editor · tier 1 standards and regulators · section 6.2.2
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting SIP 403 Forbidden from a carrier: source note sip-403-forbidden-troubleshooting-rfc8224-436. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-403-forbidden-troubleshooting-rfc8224-436
BibTeX
@misc{warmtransfer-claim-sip-403-forbidden-troubleshooting-rfc8224-436,
title = {Troubleshooting SIP 403 Forbidden from a carrier: source note sip-403-forbidden-troubleshooting-rfc8224-436},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-403-forbidden-troubleshooting-rfc8224-436},
note = {Source note sip-403-forbidden-troubleshooting-rfc8224-436, checked 2026-09-30}
}