The ESI ePhone7 sets a new direction for business phones by delivering a mobile user experience at the desktop, enabling users to be more efficient and productive every day.

The U.S. Patent and Trademark Office has awarded ESI, a leading manufacturer of digital and IP-based business telephone systems, a patent for Quality of Service (QoS) in a Voice-over-Internet ...

ESI ePhoneGO™ mirrors the functionality of an ESI business phone, and offers a streamlined user interface which is essential for employee adoption of mobile applications.

ESI's business phone systems are sold through hundreds of factory-trained Certified Resellers. Founded in 1987, ESI is a rapidly growing, privately held corporation with headquarters in Plano, Texas.