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Standards [CURRENT]

DIN ETS 300056/A1

Integrated Services Digital Network (ISDN) - Call Waiting (CW) supplementary service - Service description; English version ETS 300056:1991/A1:1996
Edition 1997-10

Standards [CURRENT]

DIN ETS 300202/A1

Integrated Services Digital Network (ISDN) - Call Deflection (CD) supplementary service - Service description; English version 300202:1995/A1:1996
Edition 1997-10

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DIN ETS 300056/A1

DIN ETS 300202/A1

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