# Recommendation X.75 (11/1988): Packet-switched signalling system between public networks providing data transmission services

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985512](https://www.wikidata.org/wiki/Q26985512)  
**Source**: https://4ort.xyz/entity/recommendation-x-75-11-1988-packet-switched-signalling-system-between-public-networks-providing-data-transmission-services