# Recommendation U.70 (11/1988): Telex service signals for telex to teletex interworking

> recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985469](https://www.wikidata.org/wiki/Q26985469)  
**Source**: https://4ort.xyz/entity/recommendation-u-70-11-1988-telex-service-signals-for-telex-to-teletex-interworking