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Standards [CURRENT]

DIN ETS 300187

Integrated Services Digital Network (ISDN); three-party (3PTY) supplementary service; functional capabilities and information flows; English version ETS 300187:1993
Edition 1994-01

Standards [CURRENT]

DIN ETS 300186

Integrated Services Digital Network (ISDN); Three-Party (3PTY) supplementary service; service description; English version ETS 300186:1993
Edition 1994-01

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DIN ETS 300187

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