DIN ETS 300566-2001 数字移动电话远程通信系统(阶段2).转呼补充服务.3级 (英文版本核准本 ETS 300566:1996-08 作为德国标准)
Digital cellular telecommunications system (Phase 2) - Call Forwarding (CF) supplementary services - Stage 3 (Endorsement of the English version ETS 300566:1996-08 as German standard)