Source note · Troubleshooting SIP 403 Forbidden from a carrier
RFC 3261 defines 403 Forbidden as a response where the server understood the request but refuses to fulfil it, states that authorization will not help, and says the request should not be repeated.
Checked 2026-09-30
- Vendor
- IETF
- Product
- SIP
- Subsystem
- response codes
- 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 21.4.4 (403 Forbidden)
Cite this note
APA
WarmTransfer. (2026, September 30). Troubleshooting SIP 403 Forbidden from a carrier: source note sip-403-forbidden-troubleshooting-rfc3261-definition. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-403-forbidden-troubleshooting-rfc3261-definition
BibTeX
@misc{warmtransfer-claim-sip-403-forbidden-troubleshooting-rfc3261-definition,
title = {Troubleshooting SIP 403 Forbidden from a carrier: source note sip-403-forbidden-troubleshooting-rfc3261-definition},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-403-forbidden-troubleshooting-rfc3261-definition},
note = {Source note sip-403-forbidden-troubleshooting-rfc3261-definition, checked 2026-09-30}
}