# Recommendation I.120 (11/1988): Integrated services digital networks (ISDNs)

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051378](https://www.wikidata.org/wiki/Q27051378)  
**Source**: https://4ort.xyz/entity/recommendation-i-120-11-1988-integrated-services-digital-networks-isdns-