| Subject | English | German |
| commun. | European ISDN to EDSS1 specifications | Euro-ISDN (will supercede national ISDN, e.g. DTAG protocol 1TR6, by 2000) |
| commun. | ISDN PABX Network Specification | ISDN-PABX Networking Specification |
| commun., IT | ISDN specifications | ISDN-Vorschrift |
| commun., IT | ISDN specifications | ISDN-Spezifikation |