Source note · SS7 and carrier interworking concepts
RFC 3326 defines the SIP Reason header with registered protocol values SIP and Q.850, where Q.850 carries an ITU-T Q.850 cause value in the cause parameter.
Checked 2026-09-24
Reason: Q.850 ;cause=16 ;text="Terminated"
- Vendor
- IETF
- Product
- SIP
- Subsystem
- Reason header
- Deployment
- carrier, on-premises, multi-tenant
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- RFC 3326: The Reason Header Field for the Session Initiation Protocol (SIP) — IETF / RFC Editor · tier 1 standards and regulators · Section 2
Cite this note
APA
WarmTransfer. (2026, September 24). SS7 and carrier interworking concepts: source note ss7-carrier-interworking-reason-q850-protocol. WarmTransfer. https://warmtransfer.net/knowledge/claims/ss7-carrier-interworking-reason-q850-protocol
BibTeX
@misc{warmtransfer-claim-ss7-carrier-interworking-reason-q850-protocol,
title = {SS7 and carrier interworking concepts: source note ss7-carrier-interworking-reason-q850-protocol},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/ss7-carrier-interworking-reason-q850-protocol},
note = {Source note ss7-carrier-interworking-reason-q850-protocol, checked 2026-09-24}
}