Source note · Carrier escalation evidence packages
The SIP Reason header carries a protocol value of SIP or Q.850 with a numeric cause parameter and an optional text parameter, so a Q.850 cause can be conveyed in SIP signaling.
Checked 2026-09-24
Reason: SIP ;cause=486 ;text="Busy Here"
- Vendor
- IETF
- Product
- SIP
- Subsystem
- Reason header
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3326
- 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, syntax
Cite this note
APA
WarmTransfer. (2026, September 24). Carrier escalation evidence packages: source note carrier-escalation-evidence-reason-header-q850. WarmTransfer. https://warmtransfer.net/knowledge/claims/carrier-escalation-evidence-reason-header-q850
BibTeX
@misc{warmtransfer-claim-carrier-escalation-evidence-reason-header-q850,
title = {Carrier escalation evidence packages: source note carrier-escalation-evidence-reason-header-q850},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/carrier-escalation-evidence-reason-header-q850},
note = {Source note carrier-escalation-evidence-reason-header-q850, checked 2026-09-24}
}