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Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)

superseded recommendation/international standard from the International Telecommunication Union
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Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)

Summary

Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS) is an ITU-T recommendation version[1].

Key Facts

  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s instance of is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — instance of (P31): ITU-T recommendation version[2].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s publisher is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — publisher (P123): ITU Telecommunication Standardization Sector[3].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s edition number is recorded as 11/1988[4].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s language of work or name is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — language of work or name (P407): English[5].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s publication date is recorded as +1988-11-25T00:00:00Z[6].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s official website is recorded as https://www.itu.int/rec/T-REC-I.257.1-198811-S/en[7].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s work available at URL is recorded as https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-I.257.1-198811-S!!PDF-E&type=items[8].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s number of pages is recorded as {'unit': '1', 'amount': '+12'}[9].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s standards body is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — standards body (P1462): International Telecommunication Union[10].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s title is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS)[11].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.130 (11/1988): Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN[12].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.140 (11/1988): Attribute technique for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN[13].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.210 (11/1988): Principles of telecommunication services supported by an ISDN and the means to describe them[14].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.252.1 (11/1988): Call offering supplementary services: Call Transfer[15].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.252.2 (11/1988): Call offering supplementary services: Call Forwarding Busy (CFB)[16].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.252.3 (11/1988): Call offering supplementary services: Call Forwarding No Reply (CFNR)[17].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.252.4 (11/1988): Call offering supplementary services: Call Forwarding Unconditional (CFU)[18].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.253.2 (11/1988): Call completion supplementary services: Call Hold (HOLD)[19].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.254.1 (11/1988): Multiparty supplementary services: Conference calling (CONF)[20].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.254.2 (11/1988): Multiparty supplementary services: Three-Party Supplementary Service (3PTY)[21].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.256.2a (11/1988): Charging supplementary services: Advice of charge (AOC)[22].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.256.2b (03/1993): Charging supplementary services: Advice of charge: charging information during the call (AOC-D)[23].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s cites work is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — cites work (P2860): Recommendation I.256.2c (03/1993): Charging supplementary services: Advice of charge: charging information at the end of the call (AOC-E)[24].
  • Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s ITU-T Recommendation is recorded as I.257.1 (11/1988)[25].

Body

Authorship and Creation

Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s publisher is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — publisher (P123): ITU Telecommunication Standardization Sector[3].

Publication

Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)'s publication date is recorded as +1988-11-25T00:00:00Z[6]. Its language of work or name is recorded as Additional information transfer supplementary services: User-to-User Signalling (UUS) — language of work or name (P407): English[5].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.
  3. [4] ↑ . wikidata.org.
  4. [5] ↑ . wikidata.org.
  5. [6] ↑ . wikidata.org.
  6. [7] ↑ . wikidata.org.
  7. [8] ↑ . wikidata.org.
  8. [9] ↑ . wikidata.org.
  9. [10] ↑ . wikidata.org.
  10. [11] ↑ . wikidata.org.
  11. [12] ↑ . wikidata.org.
  12. [13] ↑ . wikidata.org.
  13. [14] ↑ . wikidata.org.
  14. [15] ↑ . wikidata.org.
  15. [16] ↑ . wikidata.org.
  16. [17] ↑ . wikidata.org.
  17. [18] ↑ . wikidata.org.
  18. [19] ↑ . wikidata.org.
  19. [20] ↑ . wikidata.org.
  20. [21] ↑ . wikidata.org.
  21. [22] ↑ . wikidata.org.
  22. [23] ↑ . wikidata.org.
  23. [24] ↑ . wikidata.org.
  24. [25] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

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Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS). Retrieved May 3, 2026, from https://4ort.xyz/entity/recommendation-i-257-1-11-1988-additional-information-transfer-supplementary-services-user-to-user-signalling-uus-
MLA “Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS).” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/recommendation-i-257-1-11-1988-additional-information-transfer-supplementary-services-user-to-user-signalling-uus-.
BibTeX @misc{4ortxyz_recommendation-i-257-1-11-1988-additional-information-transfer-supplementary-services-user-to-user-signalling-uus-_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS)}}, year = {2026}, url = {https://4ort.xyz/entity/recommendation-i-257-1-11-1988-additional-information-transfer-supplementary-services-user-to-user-signalling-uus-}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Recommendation I.257.1 (11/1988): Additional information transfer supplementary services: User-to-User Signalling (UUS) — https://4ort.xyz/entity/recommendation-i-257-1-11-1988-additional-information-transfer-supplementary-services-user-to-user-signalling-uus- (retrieved 2026-05-03)

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