Our Large systems are designed for residences that have reached 5,000 to 7,000 square feet in size. These systems typically have 3-4 phone lines and anywhere from 10 to 20 phones and possibly a fax. There are normally phones in the kitchen, den or library, great room or living room, family room, 5-6 bedrooms, most bathrooms, laundry room, gym, theater and garage. Usually, there are several wireless phones for the inside of the home and possibly the pool or cabana area if applicable. Large systems tend to lean more toward the KX-NCP500 or NCP1000 since it offers all of the features needed and is built with this particular size in mind. Many times, these large system applications will include a Home-Office with separate phone lines just for the business. Adding a Voice Processing System sorts that all out by answering the business lines in the business name.