Cisco IOS SIP gateways by default map a received SIP 404 Not Found to PSTN cause 1 (unallocated number).
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco IOS SIP gateway
- Subsystem
- Cause code mapping
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Cisco IOS 15M&T
- Checked
- 2026-10-02
Sources
- SIP Configuration Guide, Cisco IOS Release 15M&T - Configuring SIP Message Timer and Response Features — Cisco · tier 2 current vendor documentation · Table 3: Default SIP Event to PSTN Cause Code Mapping
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-cisco-404-to-cause1. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-404-484-troubleshooting-cisco-404-to-cause1
BibTeX
@misc{warmtransfer-claim-sip-404-484-troubleshooting-cisco-404-to-cause1,
title = {Troubleshooting SIP 404 Not Found and 484 Address Incomplete call failures: source note sip-404-484-troubleshooting-cisco-404-to-cause1},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-404-484-troubleshooting-cisco-404-to-cause1},
note = {Source note sip-404-484-troubleshooting-cisco-404-to-cause1, checked 2026-10-02}
}