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License MAC on CUCM, Unity Connection or UCCX

CUCM, CUC and UCCX License Mac Parameters

The licenses on Cisco Unified Communications Manager (CUCM) or Cisco Unity Connection (CUC) or Cisco Contact Center Express (UCCX) are based on a string named as “License MAC“, License Mac is not same as Physical MAC address of a system. License MAC is composed based on few parameters like NTP Server, Timezone, Network Interface Card speed (NIC), Hostname, IP Address, Subnet Mask, Gateway Address, Primary DNS, SMTP Server and Certificate Information (Organization, Unit, Location, State and Country).

If any modification made to the above mentioned parameters can change the License Mac and it will make the License invalid. You might have to reach out to Cisco Licensing Team to get the License generated again.
Note : This is only valid for releases prior to 9.x CUCM or Unity Connection, as 9.x+ uses ELM/PLM.  UCCX 10X still host it’s license in Publisher UCCX node and this post is still applicable to UCCX.

Hope this helps!!

Published by Team UC Collabing

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Electrical Engineer CCNA Collaboration CCNA Voice CCNA R&S. I'm Electrical Engineer and I work like Support Engineer for a Telephony Service Provider Company. Before that I had position like Pre-Sale Engineer about small and medium multivendor telephony solutions. I have 5 years of experience working in Telephony Multivendor Projects. I am also 3 years of experience working in Support and implementation about Cisco Collaboration platforms: UCS server, UCM, Cisco Unity, Presence Server, Jabber, Gateway. Support Community is most useful in finding design, implementation and support tricks and shortcuts that greatly help me in my daily activities. If you need to contact me, please you can writte me.


CCNA Routing and Switching
Am a technology enthusiast. I work in network support providing support with implementation, maintaining and precisely troubleshooting the infra.
Realm of collaboration makes me want to learn and face new challenges more and more.