Source note · Troubleshooting SIP 403 Forbidden from a carrier
RFC 8224 has a verification service send 428 Use Identity Header when an Identity header field is required but none was received without a ppt parameter or with a supported ppt value.
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-rfc8224-428. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-403-forbidden-troubleshooting-rfc8224-428
BibTeX
@misc{warmtransfer-claim-sip-403-forbidden-troubleshooting-rfc8224-428,
title = {Troubleshooting SIP 403 Forbidden from a carrier: source note sip-403-forbidden-troubleshooting-rfc8224-428},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-403-forbidden-troubleshooting-rfc8224-428},
note = {Source note sip-403-forbidden-troubleshooting-rfc8224-428, checked 2026-09-30}
}