i've got CUCM 220.127.116.1100-1 and cisco ip phones 3905, with latest phone firmware 3905.9-2-2-0
I use this instruction Cisco Unified Communications Manager Bulk Administration: Update the User Display Name to change Display names. It works fine with my 7911, 7942 and 8945. But i recieve error message, when try to update 3905. The error is "Device Trust Mode cannot be blank for this phone". Also i noticed, that i could make any Bulk changes on all devices with message "Device is not trusted" (for exaple Cisco Dual Mode for iPhone).
How can i resolve this issue? Why 3905 are not trusted devices, and how to make them trusted?
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