Source note · SIP response codes and failure interpretation
A 403 Forbidden means the server understood the request and is refusing to fulfil it and that authorisation will not help and the request should not be repeated.
Checked 2026-09-15
The server understood the request but is refusing to fulfill it. Authorization will not help and the request SHOULD NOT be repeated.
- Vendor
- IETF
- Product
- Session Initiation Protocol
- Subsystem
- response codes
- Deployment
- not restricted
- Region
- not restricted
- Release range
- current as of 2026-09-15
- Checked
- 2026-09-15
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · RFC 3261 section 21, 403 Forbidden
Cite this note
APA
WarmTransfer. (2026, September 15). SIP response codes and failure interpretation: source note sip-403-forbidden. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-403-forbidden
BibTeX
@misc{warmtransfer-claim-sip-403-forbidden,
title = {SIP response codes and failure interpretation: source note sip-403-forbidden},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-403-forbidden},
note = {Source note sip-403-forbidden, checked 2026-09-15}
}