Source note · Cross-platform CDR normalization model
The SIP Reason header field (RFC 3326) carries a cause for a request under a protocol token, where SIP carries a SIP status code and Q.850 carries an ITU-T Q.850 cause value in decimal.
Checked 2026-09-24
Reason: SIP ;cause=486 ;text="Busy Here"
- Vendor
- IETF
- Product
- SIP
- Subsystem
- Reason header field
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3326 as updated
- 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 · Reason header field definition: protocol values and cause parameter, plus the example header
Cite this note
APA
WarmTransfer. (2026, September 24). Cross-platform CDR normalization model: source note cdr-normalization-rfc3326-reason-protocols. WarmTransfer. https://warmtransfer.net/knowledge/claims/cdr-normalization-rfc3326-reason-protocols
BibTeX
@misc{warmtransfer-claim-cdr-normalization-rfc3326-reason-protocols,
title = {Cross-platform CDR normalization model: source note cdr-normalization-rfc3326-reason-protocols},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cdr-normalization-rfc3326-reason-protocols},
note = {Source note cdr-normalization-rfc3326-reason-protocols, checked 2026-09-24}
}