# Recommendation I.140 (11/1988): Attribute technique for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051380](https://www.wikidata.org/wiki/Q27051380)  
**Source**: https://4ort.xyz/entity/recommendation-i-140-11-1988-attribute-technique-for-the-characterization-of-telecommunication-services-supported-by-an-isdn-and-network-capabilities-of-an-isdn