ETSI PRETS 300 139-1991 标准详情
- 标准号:ETSI PRETS 300 139-1991
- 中文标题:综合业务数字网( ISDN ) ,呼叫保持( HOLD )补充业务服务说明
- 英文标题:Integrated Services Digital Network (ISDN); Call Hold (HOLD) Supplementary Service Service Description
- 标准类别:欧洲通信ETS,I-ETS,PRI-ETSETS
- 发布日期:1991-01-01