Digital Subscriber System No. 1
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 the
ISDN. The interface is also called NET3 for
BRI and NET5 for
PRI lines. Can also be called CTR4. 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.
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