VoIP (Voice over Internet Protocol)

Welcome to the world of Internet telephony, brought to you by ETDS and ESI...

Sometimes called VoIP (for Voice over Internet Protocol), Internet telephony removes traditional boundaries. Phone calls are no longer limited to the telephone network. Through an amazing technological advancement, a whole new world of opportunity presents itself to the intelligent business owner.

ESI now offers the ability to connect telephone stations (with all the features and functionality one would expect from ESI) in any location anywhere in the world. Imagine sitting in a branch office in St. Louis or Seattle, using a phone that is an actual extension from your home office in Dallas.

For businesses that need more than just an extension outside of headquarters, our technology can connect the ESI phone systems (and, with the appropriate hardware, even non-ESI phone systems) at up to 100 branch offices. These multiple branch offices, as well as remote users, instantly communicate together, effectively creating one large system. As a result, each of these individual locations offers virtually all of the same features as the extensions sitting in the main office, without distance limitations. Additionally, each of the phone systems can function independently, taking full advantage of ESI's unique, robust features.


Imagine.......A fully featured office phone that doesn't have to be installed in an office: it's a great idea. It's ESI's Remote IP Feature Phone.

The Remote IP Feature Phone can be installed just about anywhere. And it truly is a regular extension on your ESI X-Class or E-Class phone system. So, whether you're operating a field office or working out of the one you live in, ESI's Remote IP Feature Phone gives you all of the great features of your office's IP-enabled ESI phone system anywhere you have a suitable broadband connection* to the office phone system; the Remote IP Feature Phone does the rest.

ESI - Link
Ever wish it could be simpler - not to mention cheaper - for the people at your various locations to talk to each other? Ever wished also that this could occur without your people losing the special features that your phone system has?

Wish no more. ESI's exciting Esi-Link ("easy-link") technology helps you unite your team members, whether they're a street, a city or a country apart.

Esi-Link uses your WAN or the Internet to join together up to 100 compatible ESI phone systems into one interconnected, system. While ESI wasn't the first company to offer a multi-site solution, it was the first to offer one that unites the many advantages of multi-site communications with the unique, high-performance features of ESI phone systems.

Remember, whether your VoIP solution needs are small, medium or enterprise class... ETDS is the place to call.

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214.741.3837