DIN EN 301131:2000-09 Integrated Services Digital Network (ISDN) - Teleaction teleservice - Service description (Endorsement of the English version EN 301131 V 1.1.1 (1999-01) as German standard) / Note: Endorsement notice
2000DIN EN 301131:2000-09 Integrated Services Digital Network (ISDN) - Teleaction teleservice - Service description (Endorsement of the English version EN 301131 V 1.1.1 (1999-01) as German standard) / Note: Endorsement notice
2000DIN EN 301131:2000 Integrated Services Digital Network (ISDN) - Teleaction teleservice - Service description (Endorsement of the English version EN 301131 V 1.1.1 (1999-01) as German standard)