# Recommendation U.202 (11/1988): Requirements to be met in providing the telex service within the ISDN

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051470](https://www.wikidata.org/wiki/Q27051470)  
**Source**: https://4ort.xyz/entity/recommendation-u-202-11-1988-requirements-to-be-met-in-providing-the-telex-service-within-the-isdn