Siemens optiPoint 420 Advance multi-line IP speaker phone
	Modular, multi-line IP speaker phone with self-labelling key functionality. 4 line, backlit LCD display 10/100 base T network interface 18 function keys with LEDs optiGuide dialog keys Fully duplex speakerphone Headset port Integrated USB port optiPoint adaptor/module G.711, G.723 & G.729 PoE on unused / used pairs Supports SIP and CorNet IP