# Recommendation I.251.2 (11/1988): Number identification supplementary services: Multiple Subscriber Number (MSN)

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q26985371](https://www.wikidata.org/wiki/Q26985371)  
**Source**: https://4ort.xyz/entity/recommendation-i-251-2-11-1988-number-identification-supplementary-services-multiple-subscriber-number-msn-