# Recommendation U.40 (11/1988): Reactions by automatic terminals connected to the telex network in the event of ineffective call attempts or signalling incidents

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985468](https://www.wikidata.org/wiki/Q26985468)  
**Source**: https://4ort.xyz/entity/recommendation-u-40-11-1988-reactions-by-automatic-terminals-connected-to-the-telex-network-in-the-event-of-ineffective-call-attempts-or-signalling-incidents