Integrated Services Digital Network (ISDN); Application of the ISDN User Part (ISUP) of CCITT Signalling System No.7 for international ISDN interconnections (ISUP version 1)
STANDARD published on 22.12.1992
Designation standards: ETSI ETS 300121-ed.1
Publication date standards: 22.12.1992
The number of pages: 9
Approximate weight : 27 g (0.06 lbs)
Country: European technical standard
Category: Technical standards ETSI