ESI Communications Server

Build your entire telecommunications strategy around one of the powerful ESI Communications Servers, knowing that they will easily adapt as your business needs change. The ESI-50, ESI-100, ESI-200, or ESI-1000 can support a traditional business phone system, a fully standards-based IP telephony system, or a combination of both. Regardless of the model, an ESI Communications Server is easy- to- use and feature-rich, allowing your business to communicate like a major player, enhancing your corporate image and projecting a larger organization to your clients and prospects. Unique integration capabilities mean call-processing efficiency at cost savings never before possible.


Cost savings

Get all the advantages of an on-premises solution with the option of moving some (or all) of your lines from analog to SIP, freeing up funds that can be utilized for other business needs.


ESI Communications Servers are highly- advanced and highly- scalable, with flexible architecture that fully supports both digital and IP-based communications so that your system can easily adapt and grow with your business.

Business continuity

Your Communication Server provides security and built-in redundancy to ensure business continuity in case of a disaster.


The unique calling features, advanced messaging, and customizable auto-attendant tools let your teams work more efficiently, spending less time on tedious communications tasks and more time getting business done.

Key Features

One-Touch Help

Perhaps our users’ best-loved feature, the help key on your desk phone provides you with one-touch access to information from the ESI Knowledge Base.

IP900 Mobile™

Extend your system’s SIP/VoIP calling functionality to your mobile device. Use Wi-Fi and mobile data instead of cellular minutes.

Intelligent Caller ID

Not only can you see at a glance who’s calling, but ESI’s patented technology even stores caller information with each voice message for one-touch call return at any time.

Intelligent Call Forwarding

Allows you to forward an outside call directly with the caller’s Caller ID information, instead of yours, so the person receiving the message can easily tell who made the call.

No Unanswered Calls

The automated attendant offers six levels and 100 branches, so you can set up auto-answering that routes calls to just the right destinations. Overflow support for live answering means you can ensure that every call is answered.

On-Hold Messages

Provide informative facts or timely promotional messaging to your callers while they wait on hold.

Automatic Call Distribution (ACD)

Streamlines incoming call handling, routing callers to the right person in the right department every time.


VIP7 is a feature-rich unified communications application that gives users simple, intuitive access to the tools they need. Users can easily view voice mail messages, calls, and chats, and access colleagues’ availability as well real-time views of call handling and service metrics.

The most integrated Cloud PBX in the market