# Recommendation I.256.2a (11/1988): Charging supplementary services: Advice of charge (AOC)

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985432](https://www.wikidata.org/wiki/Q26985432)  
**Source**: https://4ort.xyz/entity/recommendation-i-256-2a-11-1988-charging-supplementary-services-advice-of-charge-aoc-