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ESI Business Telephone Systems - Your business deserves an ESI Communications Server and the newest communications technology!
The science behind ESI communications servers is sophisticated, yet simple; each supports digitial functionality and IP-to-the-desktop, in any desired combination. ESI communications servers come in several models which vary primarily in capacity. Chances are that one will be just right for your workplace's particular communication needs.
An amazingly capable business communications system.
The innovative design of each ESI Communications Server means all vital business communications you need are built-in -- not added on.
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ESI IP Server 900 - Grows with your business - intelligently.
Today’s businesses demand the best communications tools. ESI Communications Servers come with everything you need. Built-in features include flexible digital/IP architecture, high-quality voice mail, live call recording, auto attendant, automated call distribution, advanced Caller ID, and the exclusive Esi-Dex™ speed-dialer.

Features you need, all built-in
- Patented Caller ID technology “attaches” caller information to stored messages for simple one-key redialing.
- Instant call recording stores any conversation into any voice mailbox at the touch of the RECORD key.
- Voice mail storage capacities to satisfy the needs of almost any business.
- Call automation features include auto attendant and programmable automatic call distribution (ACD) — perfect for sales or service departments.
- ESI’s unique Virtual Answer™ lets you use special greetings to help you courteously handle high call volume, based on who’s calling.
- ESI’s desktop phones include speakerphone, easy-to-read display, dedicated function keys, and userprogrammablekeys. For added mobility, there also are ESI Cordless Handsets (digital and IP).
- ESI’s Intelligent Call Forwarding™ lets you forward an outside call directly to a cell phone, branch office, or answering service with the caller’s Caller ID information rather than yours — so the person to whom the call is forwarded knows who’s really calling.
- Esi-Link™ joins up to 100 IP-enabled ESI Communications Servers over your WAN or the Internet, so they work as if they were one big ESI system.
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- A highly advanced, expandable phone system, with extensive. unique call handling features.
- A tremendously flexible architecture that fully supports both digital- and IP-based communications.
- Superior voice mail capabilities with exceptional features and messaging options.
- A multi-level, highly customizable automated attendant for call routing.
- Automated call distribution (ACD) to maximize your callers convenience.
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ESI Presence Management is an amazing way to manage your business better and keep your facilities more secure.
ESI Presence Management is an innovative combination of RF scanning technology and ESI’s award-winning communications systems, offering presence status, call control, entrance security, and documented tracking of users’ work hours and attendance history. Why it's better:

- Remote entry control with built-in doorphone.
- Access control.
- Presence indication.
- Personal call routing.
- Door-ajar alarm.
- Time and attendance management option.
- Optional live video monitoring of your facility.
- Optional access to building access records.
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ESI Mobile Messaging - Maximizes users’ access to ESI voice messages

ESI Mobile Messaging combines the advanced capabilities of an ESI business communications system with the convenience of users’ existing e-mail accounts.
When one receives a message (a voice mail or a recording) at an extension or guest mailbox, the person also receives an e-mailed notification to which a .WAV of the message is attached.
The notification’s header contains information about the message — the Caller ID name and number, as well as the call’s date, time, and duration.
Compatible with VIP for Outlook! An ESI Mobile Messaging user who also uses one of ESI’s VIP applications with Outlook gains an additional capability: simply selecting an e-mailed notification in the Outlook Inbox gives the user the ability to handle the message by using the VIP toolbar.
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ESI-50L Communications Server
The ESI-50L architecture allows expansion when required. The Base Cabinet and optional “piggybacking” Expansion Cabinet are wall-mountable and require very little space in your phone closet. When your business is ready, the entry-level ESI-50L can grow into a full-fledged ESI-50 Communications Server, with many more call-processing capabilities and productivity enhancing features (including ACD and support for PRI digital lines and IP communications).
Growth capabilities
- 56 call-processing ports
- Four voice mail channels; 15 hours of message storage
- Support for up to 32 digital stations and up to eight analog stations
- Up to eight fully functional analog ports
- Up to eight 60-Key Expansion Consoles
- Three-digit fl exible numbering plans
- System maintenance via built-in LAN/WAN connection
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