Device is not trusted.

[Apple Mahmud]

I have auto register the phone to CUCM 22.5. It's working fine, but showing "Device is not trusted "

Please anyone help to me.. How to Trust the Device or phone to CUCM.

[rmayoh]

What is the phone model you are registering? 

[Apple Mahmud]

Hi,

Thank you for your reply.

Phone model : Cisco CP3905

I looking solution please.

[rmayoh]

Hello Apple Mahmud,

 I found this other article that may be of use in this case. https://community.cisco.com/t5/ip-telephony-and-phones/cisco-7937g-device-issue/td-p/2567391 

They recommend updating firmware and certificates. I am not sure if you have tried this already or not. 

[Apple Mahmud]

How can i fix the issue please.... 

[Apple Mahmud]

CUCM version 12.5.0