| 1. | Isdn integrated service digital network 综合服务数字网络 |
| 2. | Isp : internet service provider 综合服务数字网络 |
| 3. | Isdn . telecommunications - integrated services digital network - call hold supplementary service 电信.综合服务数字网络 |
| 4. | Isdn . telecommunications - integrated services digital network - call waiting supplementary service 电信.综合服务数字网络 |
| 5. | Isdn . telecommunications - integrated services digital network management - primary rate physical layer 电信.综合服务数字网络 |
| 6. | Isdn . telecommunications - integrated services digital network - conference calling supplementary service 电信.综合服务数字网络 |
| 7. | Isdn . telecommunications - integrated services digital network management - basic rate physical layer 电信.综合服务数字网络管理 |
| 8. | Telecommunications - integrated services digital network management - overview and principles 电信.综合服务数字网络管理.概述和原理 |
| 9. | Isdn . telecommunications - integrated services digital network - user - to - user signaling supplementary service 电信.综合服务数字网络 |
| 10. | Isdn . telecommunications - integrated services digital network - packet mode bearer service category description 电信.综合服务数字网络 |