# Recommendation Q.699 (11/1988): Interworking between the digital Subscriber Signalling System layer 3 protocol and the Signalling System No. 7 ISDN User Part

> superseded recommendation/international standard from the International Telecommunication Union

**Wikidata**: [Q27051434](https://www.wikidata.org/wiki/Q27051434)  
**Source**: https://4ort.xyz/entity/recommendation-q-699-11-1988-interworking-between-the-digital-subscriber-signalling-system-layer-3-protocol-and-the-signalling-system-no-7-isdn-user-part