RFC 3261 defines 404 Not Found as the server having definitive information that the user does not exist at the domain specified in the Request-URI.
Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- SIP response codes
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3261 as published
- Checked
- 2026-10-02
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 21.4.5 (404 Not Found)
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting SIP 404 Not Found and 484 Address Incomplete call failures: source note sip-404-484-troubleshooting-404-definition. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-404-484-troubleshooting-404-definition
BibTeX
@misc{warmtransfer-claim-sip-404-484-troubleshooting-404-definition,
title = {Troubleshooting SIP 404 Not Found and 484 Address Incomplete call failures: source note sip-404-484-troubleshooting-404-definition},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-404-484-troubleshooting-404-definition},
note = {Source note sip-404-484-troubleshooting-404-definition, checked 2026-10-02}
}