FreeSWITCH maps a received SIP 404 Not Found to hangup cause UNALLOCATED_NUMBER rather than NO_ROUTE_DESTINATION.
Checked 2026-10-02
- Vendor
- SignalWire
- Product
- FreeSWITCH
- Subsystem
- Hangup cause mapping
- 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' and SIP response mapping table
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-unallocated. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-404-484-troubleshooting-fs-404-unallocated
BibTeX
@misc{warmtransfer-claim-sip-404-484-troubleshooting-fs-404-unallocated,
title = {Troubleshooting SIP 404 Not Found and 484 Address Incomplete call failures: source note sip-404-484-troubleshooting-fs-404-unallocated},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-404-484-troubleshooting-fs-404-unallocated},
note = {Source note sip-404-484-troubleshooting-fs-404-unallocated, checked 2026-10-02}
}