# Recommendation I.252.6 (11/1988): Call offering supplementary services: Line Hunting (LH)

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985390](https://www.wikidata.org/wiki/Q26985390)  
**Source**: https://4ort.xyz/entity/recommendation-i-252-6-11-1988-call-offering-supplementary-services-line-hunting-lh-