ETSI ETS 300139-ed.1

Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Service description

STANDARD published on 30.3.1992

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The information about the standard:

Designation standards: ETSI ETS 300139-ed.1
Publication date standards: 30.3.1992
The number of pages: 16
Approximate weight : 48 g (0.11 lbs)
Country: European technical standard
Category: Technical standards ETSI