IP PBX Phone System Failover Twinstar Plus CXTS4000

up to 1500 users

IP-PBX (Private Branch Exchange) failover system TwinStar Plus CXTS4000, up to 1500 users

The TwinStar Plus CXTS4000 is comprised of two Blue Steel 4000 (CXT4000) module-less VoIP servers. This robust configuration is a heavy-duty, stand-alone, pre-configured, out-of-the-box IP-PBX featuring Xorcom’s CompletePBX distribution, hot swappable disk drives, and two built-in redundant power supplies supporting up to four Astribank units. The CXTS4000 features an Intel Xeon Processor E3-1225V2 8M cache (3.20GHz), hot swappable disk drives, and two built-in redundant power supplies supporting up to four Astribank units.

Support for digital PRI and BRI ISDN and PSTN/analog phone ports can be provided by connecting external Astribank units via the USB2 ports to support up to 960 PSTN/analog phones ports, up to 24 E1 R2 / T1 PRI ports, up to 1500 users and up to 880 concurrent calls.

A multi-function LCD (Liquid Crystal Display) on the Blue Steel CXTS4000 allows the system administrator to perform several of the most common functions directly on the front panel of the IP-PBX without having to attach a keyboard and monitor. The touch panel uses a text-based menu tree to facilitate monitoring, maintenance and troubleshooting of the entire telephony system.

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Technical specifications


  • Up to 1500 users
  • Call capacity
    • Maximum number of concurrent calls: 880 (SIP only); 750 (PRI + FXS)
  • Built-in redundancy
    • Two hot-swappable, 24×7 server-grade HDDs (lockable)
    • Two internal, redundant, hot-swappable power supplies
    • Built-in power for up to four Astribanks
  • Telephony
    • Various combinations of FXS, FXO, BRI ISDN and PRI, CAS or R2 ports supported via external Astribanks
    • Supports SIP and IAX2 phones and trunks
    • Up to 8 BRI ISDN ports
    • Up to 4 PRI (E1/T1), T1 CAS, or R2 (E1) ports
  • Supports up to 30 external Astribank USB channel banks
  • Intuitive Web-based user interface


  • Processor: Intel Xeon E2124G
  • RAM: 8 GB
  • Storage: x2 500 GB SSD
  • RAID1: Dual hard-drive redundancy for increased system reliability
  • IPMI: Intelligent Platform Management Interface (IPMI) v.2
  • USB: 4
  • Fan: 3 redundant fans
  • Hardware Echo Cancellation module: Voice enhancement & echo cancellation (optional)


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