Source note · Troubleshooting SIP 403 Forbidden from a carrier
RFC 3261 has a registrar answer a REGISTER with 403 Forbidden when the authenticated user is not authorized to modify the bindings of the address-of-record.
Checked 2026-09-30
- Vendor
- IETF
- Product
- SIP
- Subsystem
- registration
- Deployment
- any
- Region
- not restricted
- Release range
- current as of 2026-09-30
- Checked
- 2026-09-30
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · section 10.3 (Processing REGISTER Requests), authorization step
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting SIP 403 Forbidden from a carrier: source note sip-403-forbidden-troubleshooting-rfc3261-registrar. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-403-forbidden-troubleshooting-rfc3261-registrar
BibTeX
@misc{warmtransfer-claim-sip-403-forbidden-troubleshooting-rfc3261-registrar,
title = {Troubleshooting SIP 403 Forbidden from a carrier: source note sip-403-forbidden-troubleshooting-rfc3261-registrar},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-403-forbidden-troubleshooting-rfc3261-registrar},
note = {Source note sip-403-forbidden-troubleshooting-rfc3261-registrar, checked 2026-09-30}
}