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Hydrogen Technologies Standards form the basic framework for market ramp-up
More information
Climate change Standards and specifications support climate targets
More information
Smart Farming Standards and specifications are drivers for the digitalization of agriculture
More information

Standards [CURRENT]

OENORM EN 300899-1 V 1.1.2
Integrated Services Digital Network (ISDN) - Signalling System No.7 - Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS1) - Part 1: Protocol specification [ITU-T Recommendation Q.699, modified]

Edition 1998-12-01

Original language English

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Hydrogen Technologies Standards form the basic framework for market ramp-up

Climate change Standards and specifications support climate targets

Smart Farming Standards and specifications are drivers for the digitalization of agriculture

OENORM EN 300899-1 V 1.1.2 Integrated Services Digital Network (ISDN) - Signalling System No.7 - Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS1) - Part 1: Protocol specification [ITU-T Recommendation Q.699, modified]

Want to learn more?

OENORM EN 300899-1 V 1.1.2
Integrated Services Digital Network (ISDN) - Signalling System No.7 - Interworking between ISDN User Part (ISUP) version 2 and Digital Subscriber Signalling System No. one (DSS1) - Part 1: Protocol specification [ITU-T Recommendation Q.699, modified]