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ETS 300 520003 : 20003 EUROPEAN DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2) - GENERAL ON SUPPLEMENTARY SERVICES European Telecommunications Standards Institute
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ETS 300 258 : 20002 PRIVATE TELECOMMUNICATION NETWORK (PTN) - SPECIFICATION, FUNCTIONAL MODELS AND INFORMATION FLOWS - PATH REPLACEMENT ADDITIONAL NETWORK FEATURE European Telecommunications Standards Institute
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EG 201 042 : 1.1.1 NETWORK ASPECTS (NA); UNIVERSAL PERSONAL TELECOMMUNICATION (UPT) UPT PHASE 2: NETWORK FUNCTIONALITIES FOR FEATURE INTERACTION European Telecommunications Standards Institute
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ETS 300 561 : 20003 DIGITAL CELLULAR TELECOMMUNICATIONS SYSTEM (PHASE 2) - PERFORMANCE REQUIREMENTS ON THE MOBILE RADIO INTERFACE European Telecommunications Standards Institute
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