Source note · ITU-T Q.850 call clearing cause values
Cause 13 call completed elsewhere is the one Q.850 cause whose application column reads SIP rather than DSS 1 or ISUP, and its definition is a rule about what an S-CSCF puts in the Reason header field of a CANCEL after a forked INVITE receives a 2xx.
Checked 2026-09-15
the S-CSCF shall in each CANCEL request it generates insert a Reason header field with a "SIP" protocol header field parameter value, a "200" cause header field parameter value, and a "Call completed elsewhere" text header field parameter value, as specified in [RFC 3326].
- Vendor
- ITU-T
- Product
- ITU-T Recommendation Q.850
- Subsystem
- Cause and location
- Deployment
- not restricted
- Region
- not restricted
- Release range
- edition 10/2018
- Checked
- 2026-09-15
Sources
- ITU-T Recommendation Q.850 (10/2018), Usage of cause and location in the Digital Subscriber Signalling System No. 1 and the Signalling System No. 7 ISDN user part — International Telecommunication Union (ITU-T) · tier 1 standards and regulators · Table 1 row for cause 13 and clause 6.2.7.1.10 Cause No. 13
Cite this note
APA
WarmTransfer. (2026, September 15). ITU-T Q.850 call clearing cause values: source note q850-cause-13-is-defined-entirely-as-sip-behaviour. WarmTransfer. https://warmtransfer.net/knowledge/claims/q850-cause-13-is-defined-entirely-as-sip-behaviour
BibTeX
@misc{warmtransfer-claim-q850-cause-13-is-defined-entirely-as-sip-behaviour,
title = {ITU-T Q.850 call clearing cause values: source note q850-cause-13-is-defined-entirely-as-sip-behaviour},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/q850-cause-13-is-defined-entirely-as-sip-behaviour},
note = {Source note q850-cause-13-is-defined-entirely-as-sip-behaviour, checked 2026-09-15}
}