ETSI TS 122 085
ETSI TS 122 085
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Closed User Group (CUG) Supplementary Services - Stage 1 (3G TS 22.085 version 3.1.0 Release 1999)
standard published 01/01/2000 by European Telecommunications Standards Institute
