Polycom SoundPoint IP550 4-Line SIP Desktop Phone With Adapter. It delivers crystal-clear HD voice quality. The phone supports shared call/bridged line appearance, easy-to-read LCD. The phone's built-in IEEE 802.3af PoE circuitry and a dual-port Ethernet. High Audio Quality VoIP Phone optimized for medium, or high call volume use. Best choice is in applications where good value and quick access to supplementary services (transfer, conference, directories etc.) is desired. Excellent for knowledge workers, managers, sales and support staff.

Manufacturer: Polycom
Model Number: SoundPoint IP 550 SIP
Adapter Model Number: WD482400500

Features:

Revolutionary voice quality using Polycom HD Voice technology
High-quality handset and speakerphone
Dedicated RJ-9 headset port
4 line keys
  2 for managing two calls on your line at the same time
  2 user programmable speed dial keys
4 soft keys
Supports both Power over Ethernet (PoE) or AC adaptor (supplied)
320 x 160 pixel high-resolution backlit graphical LCD display
Power Keys — Take advantage of the unused line keys on your Polycom phone and turn it into a powerful call handling and workgroup monitoring tool. Power Keys is an optional service that allows you to assign BLF (Presence) keys and line appearance keys to transform your phone into a powerful workhorse