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ETSI ETS 300 140

Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Functional capabilities and information flows
standard by European Telecommunications Standards Institute, 05/01/1992
Publisher: ETSI

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Stage 2 descriptions for priority 1 and 2 services covered in the MoU on ISDN

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Final draft Version 1.2.1Integrated Services Digital network (ISDN); Digital Subscriber Signalling S..

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