Four-line Corded Business System Phone features Caller ID/Call Waiting and is expandable up to 16 extensions. Offers a 200 name/number directory, visual message waiting indicator, new call indicator, remove button, display dial, 200 name/number Caller ID history, page, intercom and call transfer between stations, 32 speed dial and 16 intercom number locations, three-party conferencing, speakerphone in handset, chain dialing, rapid scroll, four-line blue backlit display, memory loss protection, auto line selection, hold, line status, Do Not Disturb feature, auto redial, last six number redial, mute, two data ports, power failure operation on all four lines, flash, and selectable ring tones. Trilingual setup menu can be viewed in English, French or Spanish. Hearing aid compatible. 2.5mm headset compatible. Compatible with AT&T 1080 and 1040. DSL compatible (splitter/filters not included).