Digital Subscriber Signalling System No. 1 (DSS1), also known as Euro-ISDN or E-DSS1 (European DSS1), is a digital signalling protocol (D channel protocol) used for ISDN. The interface is also called NET3 for BRI and NET5 for PRI lines. It is defined by ITU-T I.411 (ETS 300 102). It supports Bearer Capability, Low Level Compatibility and High Level Compatibility, ANI, DNIS and redirected number signaling in both directions. DSS1 is a pan-European standard developed by ETSI. DSS1 has been one of the keys to the success of the ISDN within European countries (as compared to, for example, the U.S.).

NI2 (North American ISDN)

National ISDN is a series of North American industry agreements which define uniform, vendor independent implementations of ISDN user-to-network interfaces. National ISDN-1 (NI-1) defined the first phase toward a uniform ISDN format. National ISDN-2 (NI-2) is the second phase of National ISDN implementation which adds to the capabilities of NI-1, and defines a uniform implementation of Primary Rate Access (PRA).

National ISDN variants

ISDN adapted for use in different countries.

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