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Select the telephone system that is right for you.

ESI Communication Servers

ESI-1000 ESI-600 ESI-200 ESI-100 ESI-50 ESI-50L

ESI Communications Servers represent an innovative approach to digital and IP communications. The science behind the switch is sophisticated in its simplicity: Design a platform with the flexibility to support digital functionality with the ability to be configured as a purely IP-based communications system. It’s ideal for any business that wants the familiarity of digital telephony, the benefits of full IP-to-the-desktop, or anything in-between.

IVX systems

IVX S-Class IVX C-Class ( we supply the parts and you install the system )
One of these all-digital, all-in-one phone systems is almost certainly what your office needs.


Our advanced multi-site solution lets you use your data network to
interconnect numerous ESI phone systems as if they were one big system.

Remote IP Feature Phone

It’s a fully featured office phone that can be installed just about anywhere you can have a broadband connection.
For use with only certain, properly equipped ESI phone systems.


VIP and VIP Professional VIP PC Attendant Console VIP ACD VIP Softphone

The name VIP means Visually Integrated Phone. It works within Microsoft® Outlook® to help you manage your ESI voice mail and contacts from your PC. VIP Professional adds still more features, such as auto-recording*, text-messaging, and color-coded monitoring of station status.
Be sure also to check out our other VIP Professional-compatible applications:
VIP PC Attendant Console, which greatly simplifies managing any busy office’s call traffic; VIP ACD, to maximize your customer service when used with ACD-equipped ESI phone systems; and VIP Softphone, which allows you to connect with your ESI Communications Server from a PC via nearly any broadband connection.

VOIP Telephone Systems

The ESI Communication Server family allows you to select VOIP or digital systems

IP telecommunications capabilities

The ESI Communications Server architecture provides a robust infrastructure for both LAN1-based IP telephony and remote IP applications.

Standards-based design

ESI Communications Servers’ IP capabilities are supported by compliance with major industry standards. ESI employs all applicable standards to ensure that, regardless of location, ESI Communications Server IP users experience the best audio quality.

• User Datagram Protocol (UDP).

• Layer 3 QoS support via DiffServ (Differentiated Services).

• Voice compression methods of G.711 (for locally installed IP stations), G.726 (for remotely installed IP stations and VIP Softphone), and G.729 (for Esi-Link connectivity).

• 802.3 100Base-TX Ethernet interfaces.

• Layer 2 Quality of Service (QoS) support through compliance with 802.1p for voice packet prioritization and 802.1q for VLAN (Layer 2) support.

• 802.3af Power over Ethernet.

• Dynamic Host Configuration Protocol (DHCP) for IP address conservation within a customer’s LAN.

• Session Initiated Protocol (SIP) to support SIP-compliant third-party IP telephones.

Capacity constraints

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  • Powerful voice mail capabilities
    The integrated voice mail system includes up to 16 always-available channels and includes ESI’s exclusive Quick Groups™, Quick Move™ and Virtual Mailbox key features.
  • Extensive phone options
    • ESI Digital Feature Phone, 24-Key or 48-Key
    • ESI 48-Key IP Feature Phone — Connects via LAN
    • ESI 48-Key Remote IP Feature Phone — Connects via WAN or Internet.
    • Standard analog sets
  • Advanced phone features
    Some examples include ESI’s enhanced Caller ID
    *, live call recording and screening, ACD, Esi-Dex™ speed-dialing, built-in message-on-hold and Verbal User Guide.
  • Esi-Link (multi-site) support
    Multiple systems can be interconnected across an enterprise’s dedicated WAN, creating virtually seamless connectivity among multiple offices. While some competing systems are unable to provide more than bare-bones phone features in such arrangements, distant extensions operate across your Esi-Link network as though they were local, providing one-button dialing, simplified call transfer, conference calling, and message sharing.
  • Remote Feature Phone capability
    With the rapid growth of DSL and other broadband services, fully functional Remote IP Feature Phones can be deployed to small remote locations such as local sub-offices or telephone workers desktops at home.

System features

  • Full integration
    One cabinet contains a phone system, voice mail/automated attendant and automatic call distributor, all working together as an integrated whole.
  • Eight message-on-hold (MOH) recordings
    This feature provides a professional sound without licensing fees. Use the three supplied music tracks, or record and use up to five of your own.
  • Auto attendant
    Provides extensive call routing, including directories, automatic day/night operation, off-premises transfer, pager notification and more.
  • Automatic call distribution (ACD)
    ACD places sales or service personnel in departments and either (a.) routes a call to the longest-idle agent or (b.) places the call on hold if all agents are busy and then immediately connects when the first agent is available. Constantly updates IP Feature Phone display regarding queues and wait times.
  • Highest voice quality
    Records voice messages with 64-kilobit-per-second sampling, for the highest quality sound a telephone line can carry.
  • Call statistics
    Delivers detailed reports at the touch of a key and provides SMDR.
  • TAPI support
    (Basic Telephony Service.) Provided through the connection between the workstation and the host ESI Feature Phone.
  • T1/PRI support
    Lets larger offices make fullest use of broadband lines.
  • Up to 30 fully functional analog ports
    Each allows voice mail, park/retrieve, transfer, page, call waiting, off-premises message delivery and more.
  • Conference calling
    Includes the ability to include up to 24 people in conferences, and a conference may contain up to four parties; so an E-Class system can support six conferences of four parties each (or eight conferences of three parties each).
  • Esi-Dex speed-dialing
    Calls any number from three separate lists (personal, station and system); uses Caller ID information or direct keypad entries.
  • Intelligent Call Forwarding™
    Forwards calls to you when you’re away from the office and sends along the real caller’s original Caller ID
    ** information (if it’s someone calling from another extension on your phone system, you even see his/her extension number), so you can see who the real caller is.
  • Dedicated overhead paging interface
    Allows intra-system paging through the speaker built into the ESI Feature Phone or through an ancillary overhead paging system.
  • Built-in QoS (IP)
    Quality-of-service control, built into the system, mitigates network data bursts’ effects on voice quality.
  • Optional IVX Presence Management
    • Presence indication
    • Access control
    • ESI’s Personal Call routing
    • Time and attendance logging (further enhanced by the Time and Management Option)

Voice mail features

  • Up to 128 built-in voice mail channels
    “Always-on” channels available for voice mail, auto attendant, call recording without using system trunks of station ports.
  • Off-premises message delivery
    Delivery to a cell phone or home phone combined with pager notification, for extensive notification capability.
  • Urgent messages
    Can deliver higher-priority messages first.
  • Message Recycle Bin (undelete)
    Remembers, and can restore, each mailbox’s 10 most recently deleted messages.
  • Quick Groups
    When a user wants to share a message with several other users, this feature lets the user do so by just pressing VOICE MAIL and the appropriate station keys.
  • Quick Move
    Press a station key during live recording to move the message automatically to that user’s mailbox.
  • Virtual Mailbox Key
    A programmable function key “tied” to any mailbox; allows simplified monitoring of a second mailbox.
  • Multiple personal greetings
    Pre-record up to three greetings and assign them to a programmable key for one-touch selection.
  • AutoPage™
    Allows a caller forwarded to a user’s voice mailbox to page the user over the user’s business’s internal overhead paging system.
  • QuickPage™
    Lets one station user QuickPage another station by pressing a designated QuickPage key followed by either a station extension or a programmable key set for a station.
  • Guest mailboxes
    Make it possible to give voice mail to personnel (such as those in outside sales or manufacturing) who may not have actual extensions assigned to them. A guest mailbox can be handled like a regular extension (e.g., listed in the directory, assigned a station key, etc.).
  • Info mailboxes
    These can be used to give callers information on a variety of different subjects by “publishing” these mailbox numbers.
  • Broadcast mailbox
    The broadcast mailbox is used to leave a single message in all of the system’s station users’ mailboxes.
  • Group mailboxes
    ESI Comunication Server can support up to 64 group mailboxes with up to 200 members each. Users can set or change the list of group mailbox members. (see capacities)
  • Message notification
    On a mailbox-by-mailbox basis, the system can be programmed to call an off-premises number or another extension to deliver messages and/or dial to an external commercial paging network to activate a user’s pager.
  • Cascade paging mailboxes
    Ten cascade paging mailboxes can be assigned to anyone who requires escalating levels of paging beyond the single level available in all user mailboxes.
  • Q & A mailboxes
    Ten question-and-answer (Q & A) mailboxes can store to 10 questions each. The individual answer segments recorded by the caller are stored as a single message, with the answer segments separated by short beep tones.
  • Optional VIP
    • Works with Microsoft Outlook
    • Provides on-screen call control, voice mail management, contact management
    • Much more than simply unified messaging

Auto attendant features

  • Six levels, 100 branches
    The many branches allow setup of a more caller-friendly answering environment, including a company directory.
  • Virtually unlimited call routing — Includes off-premises transfer, pager notification, more.

Station features

  • Call waiting
    Display shows both calls’ Caller ID information; user can toggle between calls by pressing the FLASH key.
  • Enhanced Caller ID
    ESI’s patented enhancements allow one-keystroke return of a call as well as quick addition of the caller to the user’s speed-dial list.
  • One-touch access to a number of features
    This lets the user press dedicated keys rather than having to remember multi-key codes. To access voice mail, the user just presses VOICE MAIL; to perform a conference call, CONF; or, to transfer a call, TRANSFER.
  • Esi-Dex built-in directory
    • Works with Caller ID to keep an alphabetical speed-dial list; accessible with a keystroke and shown on the display.
    • Three separate speed-dialing lists: personal, station and system.
    • Users can make entries directly from the IP Feature Phone keypad, as well as scroll through lists (to save time, users can select which names to view within each list).
  • Missed Call Key™
    Allows review of Caller ID data of an extension’s last 10 unanswered calls in which each caller didn’t leave a message. The user can return each call by pressing one key.
  • Live call recording
    Record a conversation, conference call or personal reminder memo for later playback, as well as moving or copying to others’ mailboxes.
  • Live call screening
    Works like a home answering machine; the user can listen to a message while someone leaves it. The user can pick up the handset at any time to take the call or just let the caller continue to leave a message in his/her mailbox.
  • Verbal Help Key™ and Verbal User Guide™
    These use hundreds of prompts to guide users through virtually every feature of the system.
  • Virtual Answer Key™
    For use when one is already on another call but wants to give special attention to a second call that’s in call waiting. Set as many as two programmable feature keys to be Virtual Answer Keys. Each plays a recorded greeting telling the caller the user knows he/she is calling and, depending on programming and how the prompt is recorded, can also give the caller an easy way to dial out to another extension where he/she can gain immediate assistance.
  • Service observing
    Lets authorized personnel silently observe (and record) station-to-outside calls.
  • Off-premises “reach-me”
    Allows a caller forwarded to one’s voice mailbox to reach the user at an external number (e.g., home phone or mobile phone).
  • Dedicated HOLD key
    Supports both system-wide and exclusive (station-specific) hold. Permits virtually unlimited hold “orbits.” (Also supports hold/retrieve with analog phones.) Holds calls for easy pickup at any station without elaborate codes to remember. For exclusive hold, just hold down the key for a second.
  • Optional 60-Key Expansion Console

Programmable feature keys

The programmable feature keys can be programmed as follows:

  • CO line key
    Provides direct access to a particular desired line.
  • Station key
    Provides direct access to, and lamp information for, extensions, departments, guest mailboxes, etc.
  • Speed-dial key
    Provides one-touch key for outside calls.
  • Special feature keys
    Can be set to provide one-touch access to the following features:
    • Overhead paging key
    • Message monitor key
    • Manual day/night mode key
    • Background announce key
    • Service observing key
    • Personal greeting 1
    • Personal greeting 2
    • Personal greeting 3
    • ACD agent log on/off key
    • ACD agent wrap key
    • ACD administrator key
    • Missed Call key
    • Headset key
    • Virtual Mailbox Key
    • Virtual Answer Key
    • Call forward key
    • QuickPage

Analog extension ports

Up to 30 analog extensions (28 on IVX) can be programmed, based on the number of cards installed in the system. The ports can be defined as:

  • Phone
    Designed to provide for standard 2500-type phones.
  • Common ringer
    Connected via a tip-and-ring pair; will apply ring voltage whenever a line rings in night mode.
  • Fax
    If the auto attendant detects a fax tone, it will automatically forward the tone to the analog port programmed as a fax device.
  • Modem
    Incoming calls for a modem can be manually transferred to the modem extension; also, the modem can automatically generate outbound calls.
  • Door phone
    A telephone connected to this port will automatically dial the programmed ring-down extension number whenever the set is taken off-hook.


Configuration specs = CO (Central Office) outside lines × ESI Feature Phones × analog ports.


Requires Caller ID service from your telephone service provider.

Requires use of ISDN Primary Rate Interface (PRI) line.

IVX is a registered trademark of ESI (Estech Systems, Inc.). Microsoft, Outlook, and Windows are registered trademarks of Microsoft Corporation.
E-Class products available from only Resellers with ESI factory training. Product specifications subject to change without notice. Some features mentioned herein may not yet be available.

Copyright © 2006 ESI (Estech Systems, Inc.).



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Copyright © 2006 S E K TelCom, Inc.
Last modified: 10/18/11