D
- Data Synchronization
- Day/Night Mode
- Deactivation
- Delay (Ritardo)
- Deployment
- Desk Phone (Telefono da Scrivania)
- Device Management
- Dial By Name Directory
- Dial Peer
- Dial Plan
- Dial Tone (Tono di Selezione)
- Dialed Number Identification Service (DNIS)
- DID (Direct Inward Dialing)
- Digital Phone
- Digital Signal Processing (DSP)
- Digital Subscriber Line (DSL)
- Direct Call Pickup
- Directory Assistance
- Disaster Recovery (Recupero dai Disastri)
- Distributed Call Center
- DND (Do Not Disturb)
- DNIS (Dialed Number Identification Service)
- Drop-Through
- Dropped Call (Chiamata Interrotta)
- Dropped Packet
- DTMF (Dual-Tone Multi-Frequency)
- Dual Ring
- Dynamic Call Handling
- Dynamic Routing
- Dynamically Assigned Numbers
