# Recommendation X.215 (11/1988): Session service definition for Open Systems Interconnection for CCITT applications

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26932298](https://www.wikidata.org/wiki/Q26932298)  
**Source**: https://4ort.xyz/entity/recommendation-x-215-11-1988-session-service-definition-for-open-systems-interconnection-for-ccitt-applications