ESI CS 200 Business Phone System

The ESI-200 architecture allows expansion when required. Each system cabinet (one Base Cabinet and up to three Expansion Cabinets) mounts in a standard equipment rack or on the wall.

ESI CS 200 System Highlights

(maximum capacities shown)

Total stations - 192
IP stations - 192
Digital stations - 168
Analog stations - 56
Call-processing ports - 300
Central Office (CO) lines - 84
Digital line cards (T1/PRI) - 3
Voice mail ports - Up to 24
Voice storage (hours) - Up to 600
Station/special-purpose mailboxes - 1,229
Conference ports (16 members/conference) - 24
Built-in automatic call distribution (ACD) - Yes
Shared-office tenanting (tenants) - 4
ESI Presence Management - Optional
VIP applications - Optional
Mirrored Memory Module (M3) backup - Optional

Plus other ESI Communications Server features:

  • Plus other ESI Communications Server features:
    cs 200 server
  • Both digital and IP-based
  • Standards-based design (including SIP support)
  • ESI’s Verbal User Guide™
    •Six-level, 100-branch automated attendant
  • Automatic call distribution (ACD)
  • ESI phones
  • Desktop and cordless models
  • Digital and IP
  • ESI options
  • ESI Presence Management™
  • VIP™ family of applications
  • Optional IP-based features, including Esi-Link (combines up to 100 ESI systems into one)

Extensive phone options

  • ESI Digital Feature Phone — 12-Key, 24-Key, 48-Key regular, and 48-Key TAPI all work on the esi phone system.
  • ESI 48-Key IP Feature Phone II — Connects via LAN, WAN, or Internet; provides full ESI feature set via IP, either locally or at remote location; uses industry-standard G.711 and G.726 compression to reduce bandwidth requirements.
  • ESI Cordless Handset — Two sizes each of three models: Digital, [local] IP, and Remote IP; IP models allow Power over Ethernet (PoE) or AC power for your maximum convenience.
  • Standard analog sets


phone installation services
Business Telephone System Installation, Programming & Training

Whether you have a Nortel Norstar or ESI Phone System we have the expertise to help you. If you are relocating your business and need your phone system relocated, call us, we can have you up and running with out dropping a single call.

Baltimore Phone Installation? We install business phone systems in Baltimore MD.


ESI Phone Systems

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E-Key Contact Phone: 410-227-5387
Servicing ESI & Nortel Phone Systems throughout the State of Maryland