Compatible with the ATT1040 and ATT1070 (not backwards compatible with other AT&T 4-line models) Caller ID, call waiting caller ID 200# Caller ID memory New call/message indicator Entry removal button Large blue lighted display Speakerphone 1 to 4 line capability Intercom between stations Expandable up to 16 stations Call transfer between stations 32# Speed dial 16 Intercom number locations (can be used for one-touch memory, two-touch memory, and direct station dialing) 2 Data ports Easy to install 3 Party conferencing (inside or outside lines, or a combination) Power failure protection for all 4 lines (battery not included) Individual station paging (intercom) or system-wide paging Headset jack (2.5mm) 4-Line backlit LCD display Redial/hold/mute/flash Last 6 number redial Volume control for receiver, speakerphone, headset, ringer Do not disturb Wall mountable (bracket included) Auto line selection Display dial Rapid scroll navigation pad New message indication 4 Lighted line indicators Auto redial Memory loss protection Selectable ringer tones Hearing aid compatible DSL Compatible (splitters/filter not included) Every unit in the system must be assigned an extension number for the intercom feature to work Digital answering system Programmable auto attendant 60 Minutes of record time Remote access with programmable options Call screening/intercept Time/day stamp Memo recording 1 Year manufacturer's warranty Dark silver