# Recommendation I.210 (11/1988): Principles of telecommunication services supported by an ISDN and the means to describe them

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051382](https://www.wikidata.org/wiki/Q27051382)  
**Source**: https://4ort.xyz/entity/recommendation-i-210-11-1988-principles-of-telecommunication-services-supported-by-an-isdn-and-the-means-to-describe-them