Source note · ITU-T Q.850 call clearing cause values
Each Q.850 class carries an unspecified cause used only when no other cause in that class applies, and the definitions say so in the same words for each: 31 normal, 47 resource unavailable, 63 service or option not available, 79 service or option not implemented, 95 invalid message, 111 protocol error and 127 interworking.
field report · Checked 2026-09-15
This cause is used to report a normal event only when no other cause in the normal class applies.
- Vendor
- ITU-T
- Product
- ITU-T Recommendation Q.850
- Subsystem
- Cause and location
- Deployment
- not restricted
- Region
- not restricted
- Release range
- edition 10/2018
- Status
- field report
- 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 · clauses 6.2.7.1.25, 6.2.7.2.10, 6.2.7.3.8, 6.2.7.4.5, 6.2.7.6.10 and 6.2.7.7.1
Cite this note
APA
WarmTransfer. (2026, September 15). ITU-T Q.850 call clearing cause values: source note q850-each-class-carries-an-unspecified-catch-all. WarmTransfer. https://warmtransfer.net/knowledge/claims/q850-each-class-carries-an-unspecified-catch-all
BibTeX
@misc{warmtransfer-claim-q850-each-class-carries-an-unspecified-catch-all,
title = {ITU-T Q.850 call clearing cause values: source note q850-each-class-carries-an-unspecified-catch-all},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/q850-each-class-carries-an-unspecified-catch-all},
note = {Source note q850-each-class-carries-an-unspecified-catch-all, checked 2026-09-15}
}