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ETSI ETS 300 403-2
- Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 2: Specification and Description Language (SDL) diagrams
- standard by European Telecommunications Standards Institute, 11/01/1995
- Publisher: ETSI
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Future enhancements of ISDN D-Channel signalling procedures for control of circuit switched connections applicable at the ISDN user-network interface, including multirate bearer services. (Application of Q.931)