A high-speed USB port enables connection of a variety of accessories such as D3 expansion module or WiFi sticks. The D315 also has a gigabit Ethernet switch to ensure you get the most out of local connections, and a VPN client to enable integration of an additional security layer. 

• Gigabit switch 
• USB port
• Dual IPv4 / IPv6 stack
• Wideband audio
• Sensor hook switch
• 5 configurable function keys with LEDs
• 4 SIP identities
• Desk or wall mounting