Q.931: ISDN user-network interface layer 3 specification for basic call control

Publisher

ITU-T

URL

https://www.itu.int/rec/T-REC-Q.931

Published

2023-12-01

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

ITU-T; recommendation text free to download under ITU terms; no-redistribution; short excerpts and locators only

Source notes citing this source

• The most recent in-force Q.931 component is Amendment 2 (12/23), which adds support for calling line identification authentication. in context
• ITU-T Q.931 is the ISDN user-network interface layer 3 specification for basic call control; its base in-force version is dated 05/98. in context

Cite this source record

APA

WarmTransfer. (2023, December 1). Q.931: ISDN user-network interface layer 3 specification for basic call control. WarmTransfer. https://warmtransfer.net/knowledge/sources/itu-t-q931

BibTeX

@misc{warmtransfer-itu-t-q931,
  title  = {Q.931: ISDN user-network interface layer 3 specification for basic call control},
  author = {{WarmTransfer}},
  year   = {2023},
  url    = {https://warmtransfer.net/knowledge/sources/itu-t-q931},
  note   = {ITU-T, accessed 2026-09-24}
}