:.. Speakerphone Multilingual Menu Support Chinese, Danish, Dutch, English (Canada / US / UK), French, German, Italian, Japanese, Korean, Norwegian, Portuguese, Russian, Spanish, Swedish, Polish, Slovenian Hearing Aid Compatible Acoustic Clarity Technology USB Port High Definition Audio Technology Remote Missed Call Notification One-Touch Redial Call Timer IEEE 802.3af Power over Ethernet (PoE) Support Optional AC Adapter (Not Included) Do Not Disturb Call Transfer Call Forwarding Call Waiting One-Touch Speed Dial SIP Voice Over Internet Protocol (VoIP) ADA Volume Control Compliant 12-Line Operation Dual-Port Gigabit Ethernet Switch Corded Voice Over IP Phone 12 Predefined Hard Keys Call Hold / Call Wait RJ-9 Headset Jack 3.5" TFT Color LCD Display Dual-Port 10/100/1000 Mbps Ethernet Switch