ETSI TS 123 083
ETSI TS 123 083
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Call Waiting (CW) and Call Hold (HOLD) supplementary services - Stage 2 (3GPP TS 23.083 version 3.2.0 Release 1999)
standard published 10/01/2000 by European Telecommunications Standards Institute
