# Recommendation I.252.4 (11/1988): Call offering supplementary services: Call Forwarding Unconditional (CFU)

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985388](https://www.wikidata.org/wiki/Q26985388)  
**Source**: https://4ort.xyz/entity/recommendation-i-252-4-11-1988-call-offering-supplementary-services-call-forwarding-unconditional-cfu-