This AT&T Small Business Phone System Model 1040 is a versatile and reliable communication solution for any office or work environment. With the ability to support up to 4 lines, this system is perfect for businesses that require multiple phone lines for incoming and outgoing calls.The system is designed for use with conventional phone handsets and includes all the necessary features for a professional and efficient telephone system. Whether you're looking to improve your office communication or upgrade an existing phone system, the AT&T Small Business Phone System Model 1040 is an excellent choice.