Polycom VVX 301 Features:

Backlit 8-level grayscale graphical LCD – 208×104 resolution
6 lines (programmable line keys)
4 context-sensitive soft keys
4-way navigation cluster
Fixed feature buttons include speakerphone, headset, mute, volume up/down, transfer, message, do not disturb
Dual port 10/100 Ethernet switch
Dedicated RJ-9 headset port
SIP protocol support
HD voice technology delivers life-like voice quality for handset, speakerphone, or optional wideband audio headset
Acoustic Clarity technology provides full-duplex conversations, echo cancellation, and background noise suppression
Easy deployment and administration with Polycom Zero Touch Provisioning and web-based configuration
Powered via Power over Ethernet (802.3af PoE) or optional PoE injector (sold separately; see drop down option above)
Increased memory and improved processor
Requires a minimum firmware version of 5.4.1 or later
Can add up to 3 Polycom Expansion Modules or Polycom Color Expansion Modules
Compatibility
Can be used with a variety of SIP compatible hosted service providers and SIP compatible IP PBX systems
Check with your hosted provider or IP PBX documentation to confirm system compatibility