The Panasonic KX-TG4000B works with four separate phone lines. This phone system can support up to 8 cordless handsets and operates off of just 1 phone line. This is a best multi-line phone system ever made and available in the market. Located on the base of the KX-TG4000B is an all-digital answering system with 100-minute capacity and auto attendant. This Panasonic system provides separate voice mailboxes and individual greetings for each cordless handset in the system. And, unlike other messaging systems that allow only one user's voice mail to be accessed at a time, the KX-TG4000B enables simultaneous voice mail operation from each handset regardless of the phone line in use. KX-TG4000B Features: 2.4GHz Cordless Phone System Digital FHSS Technology 4-Line Operation Caller ID / Call Waiting Expandable Up To 8 Handsets 100 Minute Digital Answering System - Up To 8 Individual Voice Mailboxes with Separate Greeting Messages - Automated Attendant - Time and Day Stamp - Remote Access - Message Transfer - Voice Menu Digital Duplex Speakerphone Dual 3-Line Backlit LCD Display Dual Illuminated Keypad 50 Station Caller ID Memory on Base 30 Station Caller ID Memory on Handset 100 Station Phone Directory / Dialer on Base 50 Station Phone Directory / Dialer on Handset 3-Way Conferencing v 20 Minute Power Fail Operation Adjustable Ringer / Volume Control Automatic Intercom Call Transfer 2-Way Paging Tone / Pulse Dialing Redial Hold Pause Flash Group Ring Headset Jack Belt Clip - Included w/ Brand New Models Factory Serviced Includes 90 Day Warranty!