The SIP-T44U IP phone is a feature-rich business tool for excellent communications and extended functionality. It is a 12-line IP phone that comes with a 2.8-inch mono display and EXP43 expansion module support. Thanks to Yealink Optima HD Voice technology and wideband codec, the T44U delivers outstanding audio quality supporting crystal-clear communications. Features: - Up to 12 VoIP accounts - Smart Noise Filtering - 5-way conference call - Remote access to the phone book via XML/LDAP - 8 line keys with LED - 5 feature keys: message, headset, mute, redial, hands-free speakerphone