Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 3 for the international interface; Part 18: Completion of Calls to Busy Subscriber (CCBS) supplementary service [ITU-T Recommendation Q.733, clause 3 (1997), modified]
STANDARD published on 31.8.1998
Designation standards: ETSI EN 300356-18-V3.1.3
Publication date standards: 31.8.1998
The number of pages: 8
Approximate weight : 24 g (0.05 lbs)
Country: European technical standard
Category: Technical standards ETSI