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ETS 300 138-1 : 20002 INTEGRATED SERVICES DIGITAL NETWORK (ISDN); CLOSED USER GROUP (CUG) SUPPLEMENTARY SERVICE - DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. ONE (DSS1) PROTOCOL European Telecommunications Standards Institute
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ETS 300 584 : 20001 EUROPEAN DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2) - TERMINAL ADAPTATION FUNCTIONS (TAF) FOR SERVICES USING SYNCHRONOUS BEARER CAPABILITIES European Telecommunications Standards Institute
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ETS 300 624 : 20001 DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2) - SUBSCRIBER AND EQUIPMENT TRACE European Telecommunications Standards Institute