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Standards [CURRENT]

DIN ETS 300140

Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; functional capabilities and information flows; english version ETS 300140:1992
Edition 1992-12

Standards [CURRENT]

DIN ETS 300137

Integrated Services Digital Network (ISDN); Closed User Group (CUG) supplementary service; functional capabilities and information flows; english version ETS 300137:1992
Edition 1992-12

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functionai ccitt req.ind ENTITY resp.conf information
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