Source note · Carrier escalation evidence packages
RFC 3398 maps ISUP cause 18 (no user responding) to SIP 408 Request Timeout and cause 19 (no answer from user) to SIP 480 Temporarily Unavailable.
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-18-19. WarmTransfer. https://warmtransfer.net/knowledge/claims/carrier-escalation-evidence-isup-cause-18-19
BibTeX
@misc{warmtransfer-claim-carrier-escalation-evidence-isup-cause-18-19,
title = {Carrier escalation evidence packages: source note carrier-escalation-evidence-isup-cause-18-19},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/carrier-escalation-evidence-isup-cause-18-19},
note = {Source note carrier-escalation-evidence-isup-cause-18-19, checked 2026-09-24}
}