The AT&T 945 4-Line Speakerphone with Intercom. Speakerphone is expandable to a 16 station telephone system. The 945 is compatible with AT&T 974, 984, 944, 955 and 964 telephones. The 945 is hearing aid compatible and can be connected to up to four incoming telephone lines.This phone features a speakerphone for hands-free use and a headset jack compatible with most two-band 2.5mm headsets (sold separately). The 945 allows paging, intercom and call transfers between system phones and is capable of connecting three parties in a conference call. This phone also features a 32 number memory for faster dialing.945 Features : Corded Phone 4-Line Operation Expandable Up To 16 Stations Hearing Aid Compatible Wall Mountable Speakerphone Backlit LCD Display (4-Line) 32 Station Phone Directory / Dialer 3-Way Conferencing Power Failure Operation Speaker Digital Volume Control Selectable Ringtones Intercom / Paging / Call Transfer Chain Dial Rapid Scroll Auto Line Selection 2 Data Ports Allows the Connection of Fax Machines or Modems 6 Number Redial Hold Mute Pause Flash Do Not Disturb Headset Jack