# Recommendation E.422 (11/1988): Observations on international outgoing telephone calls for quality of service

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26932019](https://www.wikidata.org/wiki/Q26932019)  
**Source**: https://4ort.xyz/entity/recommendation-e-422-11-1988-observations-on-international-outgoing-telephone-calls-for-quality-of-service