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Why do customers love the ESI Cloud PBX?

The ESI eCloud PBX features easy administration using the web-based Cloud dashboard, giving users real-time visibility into their business communications. The ESI solution is designed specifically to work in sync with ESI designed and manufactured business phones, providing an end to end integrated communication system. ESI delivers solutions that are easy to use, manage, buy and deploy making it easy to communicate!

Easy to Use

Experience the most user-friendly phone system, designed to increase productivity and keep your business growing.

  • One-touch Help & How-To videos ease pressure on IT staffs that support users.
  • Visual voice mail delivered to your email so you see who has called your with click to dial capabilities.
  • View the availability status of co-workers with color-coded presence icons.

Easy to Manage

Give system administrators control to manage routine changes and customization across all sites connected to your system.

  • Web-based administration dashboard guides users through set-up and simple programming
  • Drag-and-drop button mapping makes changes a snap.
  • Automatic software updates mean you'll always be up to date with the latest enhancements.

Easy to Buy

Flexible, role-based user packages  allow companies to stop paying for features that aren't used and no hidden extra charges. 

  • Stop overpaying for features that your employees do not use or need.
  • On-demand conference bridges save money from expensive subscriptions.
  • 30-day money-back guarantee for all ESI products.

Easy to Deploy

With many options for deployment, ESI offers  users the flexibility to connect multiple devices to the office while on-the-go or working remotely.

  • ePhoneGO (our mobility application) extends office features to a tablet or smartphone device.
  • Connect up to three devices per user for more flexible communications.
  • Office Caller IDs displayed across all connected devices.

What makes our Cloud solution so unique?

  • Easy to use & manage: intuitive and easy to use solution equipped with the features that customers want, managed from a convenient user administration dashboard.
  • Cost savings: avoid the large up-front costs with a simple, single monthly cost versus a large upfront expense. The cost of your new phone is even included in the price of the user seat!
  • Advanced features: ESI IntelitouchTM is the unique interaction between the phones and the system, providing advanced capabilities across all of your connected devices. Connect up to three devices to make sure you're never out of touch!
  • Simple installation and local support: the eCloud PBX is simple to install and set-up, but if you do run into issues Telesys is always ready to provide you fast and local support!

Key Features

Web-based administration

View voice mail, call history, contacts, and your corporate contacts and availability. 

Manage call preferences and devices

ESI ePhoneGO mobile application

Sync your mobile device to your office phone and keep employees connected to the corporate office even while in the field. Use Wi-Fi and mobile data instead of cellular minutes.

Easy phone programming

Quickly program and personalize the ESI phone from the dashboard and forget the complicated “star codes.” Simple drag-n-drop phone programming makes changes and updates easy. 

Presence indication

 View co-worker availability in the Contacts list using color-coded icons. Easily manage your own availability allowing coworkers to see if you are on the phone or available.

Visual voice mail

View voicemail messages in the web dashboard and easily manage messages or click to return calls.


Click any number from your dashboard to call instantly.  Access from contacts, call history or voicemail. 
Visual corporate directory

View and manage your corporate contacts in a simple directory.

Automated help

Access an automated help menu to quickly get the information you need with one touch.

Multiple-device support

Use up to three phones per extension so that your important calls reach you, no matter where in your workplace you may be at the moment.

ESI VoIP Business Phones

ESI is focused on designing and delivering the best in VoIP business phones.  All phones are manufactured by ESI, enabling a deep integration between the phone and the Cloud platform, creating an end-to-end solution.

Purposefully designed ESI phones are purposefully designed to work with ESI solutions and deliver the best business communication experience for every customer.
One touch features No complicated start codes to remember for basic phone features, ESI has made it one touch simple for call recording, transfer, call park, conferencing, and voicemail and DND with fixed or programmable keys. 
Easy to use Loaded with advanced capabilities yet incredibly intuitive to use with features for everyday use all at the touch of a button. 
Simple support  Information is easily accessed to learn how to use ESI phone features.  All ESI phones have a HELP button that takes users directly to a menu for help. 
Lifetime Warranty ESI sets the gold standard for phone warranty in this market, offering advanced warranty for the life of the service contract.  

Cloud Services Business Phones


Business Phone is perfect for lower-traffic ESI Cloud PBX users who need access to system features but require less customization.


  • Network:  Ethernet 10/100 Mbps power over Ethernet (POE)
  • ESI Products:  IP Server 900, ESI Cloud PBX, ESI SIP Trunks          
  • Programmable keys: 12
  • Dedicated Voicemail key
  • ESI quick HELP key 
  • Display:  two-line, 32 character display,  adjustable backlighting
  • Full duplex speakerphone
  • Access to web-based dashboard


The ESI 45SIP Business Phone is ideal for most active ESI Cloud PBX users

  • Network:  Ethernet 10/100/1000 Mbps power over Ethernet (POE)
  • ESI Products:  IP Server 900, ESI Cloud PBX, ESI SIP Trunks          
  • Programmable keys: 16
  • Dedicated Voicemail key
  • ESI quick HELP key 
  • Display:  three-line, 56 character display,  adjustable backlighting
  • Full duplex speakerphone
  • Integrated headphone jack
  • Access to web-based dashboard

VoIP or Digital Phone?

VoIP or Digital Phone Systems?phone connected to Earth

The digital and VoIP (Voice Over Internet Protocol) telephone systems are the main types of systems manufactured today.

Although VoIP is receiving all the "hype" and is the newest technology platform, VoIP itself is only a new way to transport a call and not the way calls are processed. VoIP technology works by sending voice calls over the internet eliminating plain old telephone service (POTS) to make a call. Though calls can now be made over the internet, it does not eliminate the need for a phone service provider (carriers) to connect your voice calls to the outside world.


Fax Server – Centralized Fax Management

Go Paper-free with Telesys Voice and Data's Fax Server

Streamline your Offices and Save Some Trees.

Fax Centralization makes managing faxes and going paper free easier than ever.

Improve communication and use less paper with digital faxes. Incoming faxes are delivered to email inboxes (instead of being printed) making them easier to archive, search, and transfer.


Conferencing - Meeting Solutions for Texas Businesses

Conferencing Solutions that Keep Your Staff Connected

Valuable Conferencing Solutions

The prevalence of mobile computing demands that companies like yours have a solution to conduct meetings when members of your team are out of the office.

In order to keep their teams connected, many companies are learning to lean heavily on various conferencing solutions. In today's marketplace, mobility is essential. Instituting a streamlined conferencing solution can keep you and your staff on the same page which helps maintain team continuity. Telesys Voice and Data is your one-stop-shop for all your information technology needs. We can get you set up with the conferencing options that best meet your company's needs. The conferencing capabilities offered by Telesys Voice and Data, is just another way that we are able to deliver solutions that increase productivity, fuel efficiency, and save your organization money.


Mobile Device Management - Your Business on the Move

BYOD: The Future of Business Computing

Place Security on Your Employees' Mobile Devices

Take advantage of a new frontier in business computing with Telesys Voice and Data's Mobile Device Management solution.

It is no secret that the higher degree of access that your employees can enjoy while they're on the go, the more work they can get done. The correlation between the two has led to a substantial increase in the amount of businesses that are adopting a strategy for integrating mobile devices into their IT deployment. Enterprises first began the practice of issuing Blackberries to their exempt employees in the mid-2000s, and since then, the features of mobile devices have rapidly been developed into interfaces where employees can have complete computing devices that work well for doing business on the go. Today, the mobile device market has exploded with smartphones and tablets that have many new and dynamic capabilities. Any day now, the number of mobile devices will actually surpass the population of humans on the planet. This level of saturation presents an opportunity for small and midsized companies to follow enterprise's lead and leverage mobile computing to help promote a more productive mobile office.


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