Does an CUCM upgrade affect the device defaults?

Hello
we intend to do an CUCM upgrade from 9.1(2) to 9.2(2)SU2a.
However, our phones have the firmware 9-4-2-1S, different from the original firmware (9-3-1-SR2-1)
After the CUCM upgrade, will the device defaults get back to its original firmware version (9-3-1-SR2-1) or the current version will be kept?
Thank you
Marcos

Hi Marcos,
Yes, When you upgrade to a newer version of CUCM the phones will upgrade/downgrade to the Firmware version listed in the readme doc for the CUCM upgrade version as I have linked below. So in your case the the CUCM readme for 9.1(2)su2 is shown here;
http://www.cisco.com/web/software/282074295/116350/cucmreadme912su2a.pdf
In 9.1(2)su2 it looks like the Device defaults would be 9.3(1SR4.1) but it looks like the Device defaults in CUCM 9.1(2)su3 would be the same as what you are currently running so you would be good to go as they are 9.4(2.1) ;
http://www.cisco.com/web/software/282074295/122683/cucm-readme-912su3.pdf
You could also copy the current device defaults into something like notepad and re-enter them after the upgrade, but if it were me, I would go with the later CUCM version 9.1(2)su3.
Cheers!
Rob

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