Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 3 for the international interface; Part 17: Call Waiting (CW) supplementary service [ITU-T Recommendation Q.733, clause 1 (1992), modified]
NORMA vydaná dňa 31.8.1998
Designation standards: ETSI EN 300356-17-V3.1.3
Publication date standards: 31.8.1998
The number of pages: 9
Approximate weight : 27 g (0.06 lbs)
Country: European technical standard
Kategória: Technické normy ETSI