• ESI IP Server
• ESI CPlus
• ESI Cloud PBX
• ESI SIP Trunking

• ESI 50
• ESI 50L
• ESI 100
• ESI 200
• ESI 1000

• Present Management
• Cordless Handsets
• VIP
• VIP 7

• ESI 30D
• ESI 40IP
• ESI 60
• ESI 48Key
• Expansion Console

ESI-Estech System features

• Full integration — One cabinet contains a phone system, voice mail/automated attendant, and automatic call distribution — all working together as an integrated whole.
• Standards-based IP design¹ — Each ESI Communications Server’s IP capabilities are supported by compliance with these major industry standards:
  • UDP
  • Layer 3 Quality of Service (QoS) support via DiffServ
  • G.711, G.726, and G.729 packet compression
  • 802.3 100Base-TX Ethernet interfaces
  • Layer 2 QoS support via compliance with 802.1p and 802.1q
  • 802.3af Power over Ethernet (PoE)
  • DHCP
  • SIP
• 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 nine of your own.
• Auto attendant — Provides extensive call routing, including directories, automatic day/night operation, off-premises transfer, cell phone and 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 ESI desktop phone’s 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.
• Account codes — Let you verify client billing and manage time more accurately by inserting one or more numerical codes during a call.
• Call statistics — Delivers detailed reports at the touch of a key and provides SMDR.
• PRI support² — Lets larger offices make fullest use of broadband lines.
• Up to eight fully functional analog ports — Each allows voice mail, park/retrieve, transfer, page, call waiting, off-premises message delivery, and more.
• Conference calling — The ESI-50 supports up to 16 conference callers, with up to 16 persons per conference.
• Esi-Dex speed-dialing — Calls any number from three separate lists (personal, station and system); uses Caller ID³ 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 ID³ information (if it’s someone calling from another extension on your ESI-50 system, you even see his/her extension number), so you can see who the real caller is.⁴
• Shared-office tenanting — Allows multiple business entities to share the same system while maintaining separation of various facilities and features. The ESI-50 supports up to two tenants.
• TAPI support — (Basic Telephony Service.) Provided via an optional VIP 7 application.
• Dedicated overhead paging interface — Allows intra-system paging through the speaker built into the ESI desktop phone or through an ancillary overhead paging system.
• Optional ESI Presence Management
  • Presence indication
  • Access control
  • ESI’s Personal Call routing
  • Time and attendance logging (further enhanced by optional third-party PC software)
  • Video monitoring support (in league with ESI Media Management)
• Optional ESI Media Management
  • Better management of your organization through informed risk reduction
  • Call logging and recording
  • Live and recorded video
  • Monitoring of ESI Presence Management building access events
  • Simple filtering for identifying notable events and recordings
  • Archival and exporting of data (including audio and video)

Analog extension ports

Up to eight analog extensions 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.
• Doorphone — A telephone connected to this port will automatically dial the programmed ring-down extension number whenever the set is taken off-hook.

Note: For doorphone functionality and far more, check out ESI Presence Management.

1. Some IP-related features require optional equipment. Current ESI desktop IP phones and ESI Cordless Handset II (as well as IP models of legacy ESI Cordless Handsets) not for use with ESI systems introduced prior to 2007.

2. The ESI-50 doesn’t support T1 lines.

3. Requires Caller ID service from your telephone service provider.

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

The History of ESI-Estech

ESI is a privately held corporation with headquarters in Plano, Texas, just outside Dallas. Rapid growth, stable management, and innovative technology have characterized ESI since its founding in 1987.

ESI develops business communications products targeted to businesses of various sizes (with an emphasis on small- and medium-sized businesses), and markets those products through a diverse Reseller organization that includes a broad cross-section of telephone interconnect companies and independent telephone companies throughout North America. 

Because ESI is an independent U.S. manufacturer that designs its own combined business communications systems, each ESI product is aggressively priced and possesses unique, leading-edge features. Market agility allows ESI to meet industry needs more efficiently than larger companies can, and advanced product design gives ESI a competitive edge over more limited competitors. 

Cutting-edge technology, award-winning products and a progressive vision define the ESI difference.