Source note · PRI and TDM gateway interworking
Under RFC 3398, a SIP status code not listed in the mapping table SHOULD result in an ISUP REL with cause 127 (interworking unspecified).
Checked 2026-09-24
- Vendor
- IETF
- Product
- RFC 3398
- Subsystem
- status-to-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, paragraph preceding the table
Cite this note
APA
WarmTransfer. (2026, September 24). PRI and TDM gateway interworking: source note legacy-pri-tdm-unlisted-sip-cause127. WarmTransfer. https://warmtransfer.net/knowledge/claims/legacy-pri-tdm-unlisted-sip-cause127
BibTeX
@misc{warmtransfer-claim-legacy-pri-tdm-unlisted-sip-cause127,
title = {PRI and TDM gateway interworking: source note legacy-pri-tdm-unlisted-sip-cause127},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/legacy-pri-tdm-unlisted-sip-cause127},
note = {Source note legacy-pri-tdm-unlisted-sip-cause127, checked 2026-09-24}
}