FreeSWITCH documentation says that when an upstream provider answers an INVITE with 404 the fix lies upstream, as the 404 is a number the provider does not recognise.
Checked 2026-10-02
- Vendor
- SignalWire
- Product
- FreeSWITCH
- Subsystem
- Troubleshooting
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Checked
- 2026-10-02
Sources
- Chapter 42: Call-Setup Failures — SignalWire (FreeSWITCH documentation) · tier 2 current vendor documentation · Section 'Symptom: upstream returns 403, 404, 480, or 503', fix guidance
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-fs-404-fix-upstream. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-404-484-troubleshooting-fs-404-fix-upstream
BibTeX
@misc{warmtransfer-claim-sip-404-484-troubleshooting-fs-404-fix-upstream,
title = {Troubleshooting SIP 404 Not Found and 484 Address Incomplete call failures: source note sip-404-484-troubleshooting-fs-404-fix-upstream},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-404-484-troubleshooting-fs-404-fix-upstream},
note = {Source note sip-404-484-troubleshooting-fs-404-fix-upstream, checked 2026-10-02}
}