The ESI IVX-128/IVX20 128 KSU PLUS 20 MB Plus Estech Phone System is a high-quality business phone set and telecom system designed for office use. Made by ESI, this model offers features such as 128 KSU and 20 MB of storage capacity, providing reliable and efficient communication for business and industrial settings. With its advanced technology and user-friendly design, this phone system is a valuable asset for any office environment.