All models offer 10 One-Touch Speed Dial Keys, Dual Color Red/Green LED's, Voice Over and built-in Speakerphone. All 2-line display models feature 4 Interactive Soft Keys for intuitive, automated feature operation. The digital door box makes it easy and inexpensive to add communications and security for remote access doors. NEC's legendary reliability and quality standards are evident in the DS1000's innovative 32-bit architecture. This new concept features Digital Signal Processor (DSP) Technology, on-board flash memory and field software upgrade-ability. The basic DS1000 system is available with 3 lines, 8 key telephones and 4 standard touchtone phones. It is easily expandable to 6 lines, 16 key telephones and 8 standard touchtone phones by adding an expansion card. You can grow the system as you grow your business - while keeping your initial installation investment in station equipment intact. All this new technology does not come at the expense of easy installation! Easily wall-mountable cabinets, removable access covers and simplified one-pair wiring mean your initial installation and future add-ons will be quick and economical. The DS1000 builds on its base of experience with a totally revamped and redesigned feature set that further enhances the ease-of-use in its digital predecessor. The DS1000 brings a new level of speed and sophistication to the features you've come to expect from a NEC phone system. Busy offices can always keep pace with productivity features like Caller ID, Last Number Redial, Speed Dial and Hotline. Getting through to busy co-workers is never a problem thanks to extensively redeveloped Call Waiting, Voice Over, Reverse Voice Over and Off-Hook Signaling. Larger firms have a bevy of workgroup features from which to choose, such as Call Coverage on any phone, Extension Hunting, Group Call Pick-up and Multi-Party Conference. As the demands on the phone system increase, DS1000 is right there with advanced features like full NVM-Series Voice Mail Integration (highlighted by Park and Page, Conversation Record and Answering Machine Emulation). All models offer 10 One-Touch Speed Dial Keys, Dual Color Red/Green LED's, Voice Over and built-in Speakerphone. All 2-line display models feature 4 Interactive Soft Keys for intuitive, automated feature operation. A 24- or 110-Button Direct Station Selection for answering positions. NEC's legendary reliability and quality standards are evident in the DS2000's innovative 32-bit architecture. This new concept features Digital Signal processor (DSP) Technology, on-board flash memory and field software upgrade-ability. The basic DS2000 system is available with 4 slots and 48 ports. It is easily expandable to 8 slots and 112 ports by upgrading to a 112-port cabinet. You can grow the system as you grow your business - while keeping your initial installation investment in station equipment intact. All this new technology does not come at the expense of easy installation! Easily wall-mountable cabinets, removable access covers and simplified one-pair wiring mean your initial installation and future add-ons will be quick and economical. The DS2000 builds on its base of experience with a totally revamped and redesigned feature set that further enhances the ease-of-use in its digital predecessor. The DS2000 brings a new level of speed and sophistication to the features you've come to expect from a NEC phone system. Busy offices can always keep pace with productivity features like Caller ID, Last Number Redial, Speed Dial and Hotline. Getting through to busy co-workers is never a problem thanks to extensively redeveloped Call Waiting, Voice Over, Reverse Voice Over and Off-Hook Signaling. Larger firms have a bevy of workgroup features from which to choose, such as Call Coverage on any phone, Extension Hunting, Group Call Pickup and multi-party Conference. As the demands on the phone system increase, DS2000 is right there with advanced features like full NVM-Series Voice Mail Integration (highlighted by Park and Page, Conversation Record and Answering Machine Emulation).