# Recommendation I.256.2b (03/1993): Charging supplementary services: Advice of charge: charging information during the call (AOC-D)

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985433](https://www.wikidata.org/wiki/Q26985433)  
**Source**: https://4ort.xyz/entity/recommendation-i-256-2b-03-1993-charging-supplementary-services-advice-of-charge-charging-information-during-the-call-aoc-d-