ESI CS 50 Business Phone System

Communication Server

The ESI-50 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.

System highlights (maximum capacities shown)

CS 50Total stations – 52

IP stations – 12

Digital stations – 32

Analog stations – 8

Call-processing ports – 87

Central Office (CO) lines – 35

Digital line cards (T1/PRI) – 1

Voice mail ports – 6

Voice storage (hours) – Up to 60

Station/special-purpose mailboxes – 1,089

Conference ports (16 members/conference) – 16

Shared-office tenanting (tenants) – 2

ESI Presence Management – Optional

VIP applications – Optional

Mirrored Memory Module (M3) backup – Optional

ESI CS 50 Brochure Adobe PDF Brochure

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Plus other ESI Communications Server features:

  • 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)