The AT&T 1070 Corded Speakerphone is perfect for companies that need a Speaker that can handle four Lines. The phone is DSL suitable and has a three-party conferencing function that allows you to work with three people together on three different lines. Each range has its own light signal, and can be set with a different ringtones for easy difference of inbound calling. Automatic line selection means that when the phone is ringing and you pick up, you will be linked with the one that is ringing Compatible with the ATT1040 and ATT1080 (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 1 Year manufacturer's warranty Dark silver