Source note · Cross-platform CDR normalization model
RFC 6432 allows any SIP response except 100 (Trying) to carry a Reason header field with a Q.850 cause code.
Checked 2026-09-24
Any SIP Response message, with the exception of a 100 (Trying), MAY contain a Reason header field with a Q.850 cause code.
- Vendor
- IETF
- Product
- SIP
- Subsystem
- Reason header field
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 6432
- Checked
- 2026-09-24
Sources
- RFC 6432: Carrying Q.850 Codes in Reason Header Fields in SIP (Session Initiation Protocol) Responses — IETF / RFC Editor · tier 1 standards and regulators · Normative statement on Reason header in responses (section number not captured)
Cite this note
APA
WarmTransfer. (2026, September 24). Cross-platform CDR normalization model: source note cdr-normalization-rfc6432-q850-in-responses. WarmTransfer. https://warmtransfer.net/knowledge/claims/cdr-normalization-rfc6432-q850-in-responses
BibTeX
@misc{warmtransfer-claim-cdr-normalization-rfc6432-q850-in-responses,
title = {Cross-platform CDR normalization model: source note cdr-normalization-rfc6432-q850-in-responses},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cdr-normalization-rfc6432-q850-in-responses},
note = {Source note cdr-normalization-rfc6432-q850-in-responses, checked 2026-09-24}
}