Zultys are a pure IP Unified Communications vendor from California USA.  Zultys offer a carrier-grade-reliability UC platform called Media Xchange (MX).  

MX is available as a powerful physical appliance featuring built-in redundancy as well as a Linux application for running in VMware environments.

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There is a powerful CTI application called Zultys Advanced Communicator (ZAC) which provides computer-based call control, unified messaging and collaboration tools as well as a feature-rich mobile application for iOS and Android.

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Zultys unifies with MS-Exchange, SalesForce and many other applications.   It supports multisite presence and integration with Skype for Business.