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CUCM 8.6.2 Phones not registering 7841 and 8831

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Hi all

I am trying to register some new phones - 7841 and 8831.  We installed the COP and Device Pack and rebooted the cluster.  Firmware defaults in the server are sip78xx.10-1-1SR2-1 and sip8831.9-3-3-5. 

These are the first phones of these models that we are trying to use.  All other devices are up and working.  I added the phones manually, auto-reg is disabled.  These new phones are both displaying the same behavior - they booted, but neither device will register.  They are both running the the same firmware version configured as the default in the server.

I have looked at some other discussions but haven't seen any solutions that match up with our issue.   Your input and ideas appreciated, thanks

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