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Communication Server 1000 is a server-based, full-  
  featured IP PBX, providing the benefits of a converged  
  network plus advanced applications and over 450 world-  
  class telephony features. Fully distributed over IP LAN &  
  WAN infrastructure with built-in reliability and survivability,  
  Communication Server 1000 supports business-critical  
  applications, including unified messaging, customer  
  contact center, IVR, wireless VoIP and IP phones.  

IP PBX functionality delivered over IP LAN and WAN infrastructures without sacrificing features or high-
  value business communications applications
Designed to scale to meet growing enterprise requirements: 15,000 IP clients per call server; multiple Call
  Servers networked with transparent IP networking; single Gatekeeper supports up to 15,000 IP users
Built-in reliability based on VXWorks operating system and proven feature set with multiple resiliency
  mechanisms, including survivable Call Servers, Signaling Server redundancy configurations and
  survivable WAN gateways
Extensive desktop portfolio includes IP phones, software phones, 802.11 Wireless VoIP phones, as well as
  digital and analog phones to meet diverse end-user requirements
Supports business-critical applications, including IP Contact Center, CallPilot unified messaging, and
  integrated services such as conferencing, one-number-follow-me Personal Call Director, recorded
  announcement, network-wide attendant and messaging
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