That's correct. You need to rehost your license. The License MAC is going to regenerate if you enable (configure), modify or delete the following system settings; - Time zone - NTP server 1 (or none) - NIC speed (or auto) - Hostname - IP Address - IP Mask - Gateway Address - Primary DNS - SMTP server - Certificate Information (Organization, Unit, Location, State, Country) The License MAC will be regenerated for each change, if applicable, make all of your changes prior to contacting Cisco. UCCX is going to automatically generate a temporary (30 day) license so you can remain operational while you rehost your license.
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