# Recommendation I.254.2 (11/1988): Multiparty supplementary services: Three-Party Supplementary Service (3PTY)

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985411](https://www.wikidata.org/wiki/Q26985411)  
**Source**: https://4ort.xyz/entity/recommendation-i-254-2-11-1988-multiparty-supplementary-services-three-party-supplementary-service-3pty-