- BRI (Basic Rate Interface)
- Caller ID
- CSTA (Computer-Supported Telecommunications Applications)
- CSU/DSU (Channel Service Unit/Data Service Unit)
- H.323
- IMAP4 (Internet Message Access Protocol)
- IP (Internet Protocol)
- ISDN (Integrated Services Digital Network)
- LAN (Local Area Network)
- PoE (Power over Ethernet)
- SIP (Session Initiation Protocol)
- SMTP (Simple Mail Transfer Protocol)
- TDM (Time-Division Multiplexing)
- VoIP (Voice over IP)