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Here are descriptions of the more relevant changes in
15 16.0
End-to-end messages
This version fully integrates end-to-end security model, that was available only for secure calls: secure messages are now fully end-to-end encrypted.
changes
This version carries a User Interface redesign of clients and server, plus many new devices and OS version support.
changes
SIP Trunks Integration
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OS platform
Version 16.0 brings a brand new core OS platform: legacy OS core based on Fedora Core has been replaced by CentOS 7, with a stable, robust, reliable distribution.
High Availability
now supports HA cluster in Active/Passive configuration, to gain more reliability and lower downtime due to failures or maintenance.Activation code
System administrator has a clear view of licenses, including single client and temporary one used to manage transient users.
Web administration console layout has been revised to improve usability, splitting daily maintenance tasks from extraordinary tasks required rarely or during system setup.