Source note · Carrier escalation evidence packages
RFC 3398 maps ISUP cause 1 (unallocated number) and cause 3 (no route to destination) to SIP 404 Not Found.
Checked 2026-09-24
- Vendor
- IETF
- Product
- SIP-ISUP interworking
- Subsystem
- cause mapping
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3398
- Checked
- 2026-09-24
Sources
- RFC 3398: Integrated Services Digital Network (ISDN) User Part (ISUP) to Session Initiation Protocol (SIP) Mapping — IETF / RFC Editor · tier 1 standards and regulators · Section 8.2.6.1, ISUP cause to SIP response table
Cite this note
APA
WarmTransfer. (2026, September 24). Carrier escalation evidence packages: source note carrier-escalation-evidence-isup-cause-1-404. WarmTransfer. https://warmtransfer.net/knowledge/claims/carrier-escalation-evidence-isup-cause-1-404
BibTeX
@misc{warmtransfer-claim-carrier-escalation-evidence-isup-cause-1-404,
title = {Carrier escalation evidence packages: source note carrier-escalation-evidence-isup-cause-1-404},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/carrier-escalation-evidence-isup-cause-1-404},
note = {Source note carrier-escalation-evidence-isup-cause-1-404, checked 2026-09-24}
}