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Standards [CURRENT]

DIN ETS 300056

Integrated Services Digital Network (ISDN); Call Waiting (CW) supplementary service; service description; english version ETS 300056:1991
Edition 1992-09

Standards [CURRENT]

DIN ETS 300059

Integrated Services Digital Network (ISDN); Subaddressing (SUB) supplementary service; service description; english version ETS 300059:1991
Edition 1992-09

Standards [CURRENT]

DIN ETS 300128

Integrated Services Digital Network (ISDN); Malicious Call Identification (MCID) supplementary service; serving description; english version ETS 300128:1992
Edition 1992-12

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Dienstbeschreibung freephone B.P.152 intercommunication non-ISDN Telekommunika
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