ESI Communications Servers
ESI-1000  •  ESI-600  •  ESI-200  •  ESI-100  •  ESI-50  •  ESI-50L
Regardless of which model you select, an ESI Communications Server will serve your needs now and for years to come. This fully flexible communications platform can support both digital telephony and IP-to-the-desktop in any desired combination.1 ESI Communications Servers also deliver massive expandability and the greatest functionality ESI has ever offered.

Each ESI Communications Server combines multiple first-rate, feature-rich systems into one tightly integrated unit:
• Business phone system
• Voice mail
• Automated attendant with six levels and 100 branches
• Messages-on-hold
• Enhanced Caller ID4
• Automatic call distribution (ACD)3
• Intelligent Call Forwarding™ 3 5
• Optional Windows-based VIP family of communication management tools
• Optional ESI Presence Management
• Optional ESI Media Management
• Optional ESI Bluetooth® Voice Integration
• Network-based VoIP telephony2