ETSI TS 100 516
ETSI TS 100 516
Digital cellular telecommunications system (Phase 2 ) (GSM); Call Waiting (CW) and Call Holding (HOLD); Supplementary Services - Stage 1 (GSM 02.83 version 7.0.0 Release 1998) Edition: 7.0.0European Telecommunications Standards Institute / 01-Aug-1999 / 15 pages