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

Publisher

International Telecommunication Union (ITU-T)

URL

https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-Q.850-201810-I!!PDF-E&type=items

Published

2018-10-14

Updated

unknown

Accessed

2026-09-15

HTTP status

200

License

ITU-T Recommendation; ITU copyright, free public download; no-redistribution; short excerpts and locators only

Claims citing this source

• 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. fact in context

Cite this source record

APA

WarmTransfer. (2018, October 14). 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. WarmTransfer. https://warmtransfer.net/knowledge/sources/itu-t-q850-2018

BibTeX

@misc{warmtransfer-itu-t-q850-2018,
  title  = {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},
  author = {{WarmTransfer}},
  year   = {2018},
  url    = {https://warmtransfer.net/knowledge/sources/itu-t-q850-2018},
  note   = {International Telecommunication Union (ITU-T), accessed 2026-09-15}
}