Estech Systems, Inc.(ESI) delivers high-performance cloud and on-premises phone systems that are easy to use and uniquely integrated. ESI provides end-to-end communication solutions that give businesses the power to choose the features that they need to meet their goals. ESI is a privately-held corporation headquartered in Plano, Texas. Founded in 1987, the company has sold over 400,000 phone systems and deployed more than three million phones nationwide. ESI was the first company to build a truly combined telephone and voice mail system, as well as the first to build a purely IP-based business communications system, and has numerous patents granted or pending on its products’ unique designs and capabilities. ESI is highly regarded for supporting uniquely integrated, real-world applications with practical and effective features.SITE: www.esi-estechXXXXADDRESS 3701 E. Plano Parkway Ste. 300 Plano TX 75074-1819