T31P VoIP SIP telephone, 2 x Fast Ethernet, 2 x line keys, PoE required, AC optional, 2.3 inch TFT LCD, HD audio, RJ9 headset jack, EHS support for specific Jabra and specific Plantronics headsets (cable required, SKU #EHS35), adjustable stand (two positions, can also be used as a wall mount bracket), supports YDMP / YMCS. Optional AC power supply, SKU # PS5V600US.