Polycom VVX 310 Business Media Phone Backlit grayscale graphical LCD (208 x 104) 6 line or speed dial keys. 2 x Ethernet 10/100 or GigE (VVX 310). HD Voice up to 7KHz on all audio paths. SIP Voice Over Internet Protocol (VoIP) phone. Powered Over Ethernet (POE), Optional AC Adapter (Not Included).