# Recommendation I.252.1 (11/1988): Call offering supplementary services: Call Transfer

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985384](https://www.wikidata.org/wiki/Q26985384)  
**Source**: https://4ort.xyz/entity/recommendation-i-252-1-11-1988-call-offering-supplementary-services-call-transfer