Screen : The viewing angle of the display on the 1616-I is adjustable and measures 4 lines by 24 characters, Lines : 1 Networking : Dual Ethernet ports for connection of phone and collocated PC w/VLAN separation Voice Codecs : G.711, G.722, G.726, G.729ab Quality Of Service : High Network Protocols : H.323 Features : Deskphone supports 16 administrable feature buttons on the phone itself—and a 32-button expansion model provides access to a total of 48 feature keys or speed dial buttons, Each of the buttons features a dual LED (red, green) providing explicit status for the use, includes several fixed feature keys for common telephone tasks including conference, transfer, drop, hold and mute, includes a high quality 2-way speakerphone, and supports a broad portfolio of Avaya wired and wireless headsets through its integrated headset jack, Context sensitive user interface along with 3 softkeys and a 4-way navigation cluster Power Supply : PoE 802.3af class 2 device, also supports a local power supply Dimensions : N/A Weight : N/A