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8831 phones fail to download and are unregistered

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Active Load ID: sip8831.10-3-1SR3-4
Download Status: Failed
Requested Load ID: sip8831.10-3-1SR2-2
Download Server: XXX.XXX.XXX.XXX
Inactive Load Failure Reason Internal Phone Error

Above is the phone status in CUCM (release 11.5.1). We have 7841 and 8861 sets that all register and are working fine. Only the 8831 set will not register and have the failed download status. IP address has been masked but it is a legitimate CUCM IP address on our network.

Any ideas how to correct the failed download and failed registrations for these phone sets?

15 Replies 15

The staged upgrade worked for me.  Thanks!