Claim record · SIP response codes and failure interpretation
A 404 Not Found means the server has definitive information that the user does not exist at the domain in the request address or that the domain is not one it handles.
fact · verified 2026-09-15
The server has definitive information that the user does not exist at the domain specified in the Request-URI.
- Vendor
- IETF
- Product
- Session Initiation Protocol
- Subsystem
- response codes
- Deployment
- not restricted
- Region
- not restricted
- Release range
- current as of 2026-09-15
- Status
- fact
- Confidence
- 0.90
- Verified
- 2026-09-15
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · RFC 3261 section 21, 404 Not Found
Cite this claim
APA
WarmTransfer. (2026, September 15). SIP response codes and failure interpretation: claim sip-404-not-found. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-404-not-found
BibTeX
@misc{warmtransfer-claim-sip-404-not-found,
title = {SIP response codes and failure interpretation: claim sip-404-not-found},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-404-not-found},
note = {Claim sip-404-not-found, verified 2026-09-15}
}