Each ESI Communications Server combines multiple first-rate, feature-rich systems into one tightly integrated unit:

• Business Phone System
• Voicemail
• Automated Attendant with 6 levels and 100 branches
• Music on Hold
• Enhanced Caller-ID**
• Automated Call Distribution (ACD)
• Intelligent Call Forwarding™†
• Optional Windows-based VIP family of communication management tools
• Optional ESI Presence Management
• Network-based VoIP telephony*
  
  

Properly configured by your Certified ESI Reseller, an ESI Communications Server can handle your heaviest communications needs. There are multiple models, with differing capacities, but all share the features mentioned above: Systems capacity is below :

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

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)