# Recommendation I.231.8 (11/1988): Circuit-mode bearer service categories : Circuit-mode 1920 kbit/s unrestricted, 8 kHz structured bearer service

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051397](https://www.wikidata.org/wiki/Q27051397)  
**Source**: https://4ort.xyz/entity/recommendation-i-231-8-11-1988-circuit-mode-bearer-service-categories-circuit-mode-1920-kbit-s-unrestricted-8-khz-structured-bearer-service