Cisco IP Phone 8865 stuck at registration on CUCM 10.5.2

[Kevin Lau]

I am trying to register a Cisco IP phone 8865 with sip8845_65.12-0-1-11 on CUCM 10.5.2 but it is stuck at registering while the old 9951 with sip9951.9-4-2SR2.2 is registered without problem. 

[Roger Kallberg]

Have you checked that there is no error in ITL file download on the device? It is quite common that there are differences in security settings on devices that has been previously registered, but then put away for a while before it is then put into use again. It there are errors with ITL download the device will not register. This can be solved by resetting the security configuration on the device.

[Kevin Lau]

The 8865 is new out of box, I have tried reset security and reset all settings, both are not working. From phone status message ITL file is installed, .cnf.xml.sgn file is ok.  I am using non-secure profile.  The phone just stuck at registering state.

[Kevin Lau · Accepted solution]

I put an older 8865 firmware load to CUCM and finally registered.