from the Snom website (link)
SIP based IP phone
Ideal for the office and everyone who spends a lot of time on the phone, the snom 320 is an affordable, yet powerful SIP business phone with built-in, full-duplex speakerphone and three-party conference bridging.
The snom 320′s built-in three-way conference bridge eliminates external devices and services while offering high audio quality and minimal latency. These savings together with the snom 320′s very low energy consumption (1.0 to 1.5 w-hrs in standby) and PoE (Power over Ethernet) truly help to lower your costs.
Visit the snom homepage for more information