About Us

Get To Know ESI


At Estech Systems, Inc. (ESI), we're all about making business communication easy. Whether you need cloud or on-premises phone systems, we've got you covered with high-performance solutions that are not only easy to use but also uniquely integrated.

Based in the heart of Plano, Texas, we're privately-held by a bunch of tech enthusiasts who've been at it since 1987. With over 400,000 phone systems sold and three million phones making connections nationwide, we know a thing or two about keeping conversations flowing.

What sets us apart? Well, we were pioneers in creating the first-ever combined telephone and voicemail system. Plus, we were trailblazers in building purely IP-based business communications systems. Patents? Yep, we've got those too – our products boast some pretty unique designs and capabilities. But it's not just about the tech lingo; we're here to support real-world applications. Our solutions are not just practical; they're downright effective.

While you may not hear our name as much as some competitors, we've stood toe-to-toe for more than three decades because we know how to deliver technology that helps our customers thrive. If you're looking for a communication partner that understands your unique needs, ESI is the name to remember.


Our Core Values


Our purpose is to contribute to our customers' success by making it easy to communicate!

  • Deliver products and services that are intuitive and easy to use.

  • Practice "Success with Significance."

  • Enjoy a fit, friendly and fun work and life style.

  • Encourage growth through employee and family education.

  • Provide an exceptional customer experience.

Our Patents


ESI has a number of U.S. Patents, either granted or pending, on our products’ unique designs and capabilities. Our innovative products use significantly less hardware, resulting in increased reliability. Due to our diversity of products and additional features, we provide significant benefits and greater long-term customer satisfaction. Our patents that have been granted include:

  • 6,067,349 and 7,221,741 - Dialing using Caller ID.
  • 6,252,944 - Telephone call/voice processing system
  • 6,842,505 - Communications system enhanced with human presence-seeking capabilities
  • 6,925,167 - Service observing in a voice over IP telephone system
  • 6,940,962 - Dial-on-hold
  • 7,068,684 - Quality of service in a voice over IP telephone system
  • 7,123,699 - Voice mail in a voice over IP telephone system
  • 7,564,834 - Shared knowledge in a telephone system