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!!

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2 Responses

  1. collins says:

    Hello,does it work for cucm 12 or 12.5?
    It works for uccx 12.1

  2. Aswin says:

    Thanks for the explanation.
    If rehosting uccx license procedure after the License MAC changes done is explained, then that will be more helpful.

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