Estech Systems, Inc.
Corporate brand
UnclaimedESI (Estech Systems) is a Plano, Texas-based provider of cloud and on-premises business phone systems, founded in 1987 and now part of Crexendo.
Last updated September 28, 2026
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Overview
Estech Systems, Inc., commonly known as ESI, is an American telecommunications equipment and services company headquartered in Plano, Texas. Founded in 1987, the company has spent more than three decades building business phone systems, and it describes itself as a premier provider of cloud and on-premises telecommunications that bring together desktop phones, smartphone and softphone apps, texting, video conferencing and AI collaboration. Its two main product families are the eCloud PBX, a hosted cloud VoIP platform aimed at distributed workforces, and the eSIP Evolution Series, an on-premises IP phone system for organizations that prefer to keep communications infrastructure on site. ESI positions itself around ease of use and integration. The company states that it has sold over 400,000 phone systems and that three million phones are making connections nationwide. It also claims a pioneering role in the category, saying it created the first combined telephone and voicemail system and was a trailblazer in purely IP-based business communications systems, with patented designs and capabilities. Its stated purpose is to contribute to customers' success by making it easy to communicate, and its core values emphasize intuitive products, an exceptional customer experience, and a fit, friendly and fun work and lifestyle. In March 2026, ESI joined the Crexendo family, becoming a subsidiary of Crexendo, Inc., a Nasdaq-listed company trading under the ticker CXDO. The official website now presents the business as "ESI, a Crexendo Company," and a recent-news banner announces that ESI is now a Crexendo company. ESI continues to serve its installed base of cloud and on-premises customers, and it has issued operational notices to its cloud users, such as new password and voicemail PIN rules for eConsole and ePhoneGO 2. While ESI may not have the same brand recognition as some larger competitors, the company emphasizes that it has stood toe-to-toe with the market for more than three decades by delivering technology that helps customers thrive. Its product marketing resources include blogs, free downloads, e-books, white papers and training videos, reflecting an ongoing focus on customer education and support.
History
Estech Systems, Inc. (ESI) was founded in 1987 and has been based in Plano, Texas, in the heart of the Dallas–Fort Worth technology corridor. From its early years, the company focused on business telephone systems, and it claims to have been a pioneer in the category: it says it created the first-ever combined telephone and voicemail system and was a trailblazer in building purely IP-based business communications systems. Those innovations are backed by patents covering unique product designs and capabilities. Over more than three decades, ESI built an installed base that it describes as more than 400,000 phone systems sold and three million phones making connections nationwide. The company developed two principal lines: the eCloud PBX, a hosted cloud VoIP platform designed for the modern distributed workforce, and the eSIP Evolution Series, an on-premises IP phone system for organizations that need on-site communications infrastructure. Alongside these platforms, ESI offers desktop phones, smartphone and softphone apps, texting, video conferencing and AI collaboration capabilities, positioning itself as a one-stop communications partner. ESI has long emphasized ease of use, integration and customer support. Its stated purpose is to contribute to customers' success by making it easy to communicate, and its core values include delivering intuitive products, practicing "Success with Significance," encouraging growth through employee and family education, and providing an exceptional customer experience. The company maintains a range of product marketing resources, including blogs, free downloads, e-books, white papers and training videos, and it provides customer service documentation and FAQs. A major turning point came in March 2026, when ESI joined the Crexendo family. Crexendo, Inc. is a Nasdaq-listed company (ticker CXDO), and ESI now operates as "ESI, a Crexendo Company." The official website announced the change with a recent-news banner stating that ESI is now a Crexendo company, and the About Us page confirms the March 2026 acquisition. Following the acquisition, ESI continued to communicate with its cloud users about operational matters, such as new password and voicemail PIN rules for its eConsole and ePhoneGO 2 products. The company remains active in serving both cloud and on-premises customers across the United States.
- 2026
ESI joins the Crexendo family, becoming a subsidiary of Crexendo, Inc. (Nasdaq: CXDO).
- 1987
Estech Systems, Inc. (ESI) is founded and begins operating in the business telephone systems market.
ESI introduces what it describes as the first-ever combined telephone and voicemail system.
ESI becomes a trailblazer in purely IP-based business communications systems.
ESI reaches more than 400,000 phone systems sold and three million phones connecting nationwide.
Products and positioning
Award-winning, easy-to-use cloud and on-premises business communications for organizations that value integration and simplicity.
eCloud PBX
A hosted cloud VoIP business phone platform ideal for the modern distributed workforce, delivering cutting-edge performance and reliability across one locale or several around the country.
eSIP Evolution Series
An on-premises IP phone system designed to outperform competitors, handle many tasks with flexibility, and provide intelligent feature sets.
eConsole
An ESI cloud product for which new password and voicemail PIN rules were announced.
ePhoneGO 2
An ESI cloud product for which new password and voicemail PIN rules were announced.
Controversies
Recent events
Sources4 sources
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