# Recommendation I.254.1 (11/1988): Multiparty supplementary services: Conference calling (CONF)

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985409](https://www.wikidata.org/wiki/Q26985409)  
**Source**: https://4ort.xyz/entity/recommendation-i-254-1-11-1988-multiparty-supplementary-services-conference-calling-conf-