[cisco-voip] Easiest way to upgrade CM 3.3 to CUCM 8.5 with phone model replacement

[Ki Wi]

Any idea?
I have experience of upgrading in upgrading CM3.3 --> 4.X ---> 7.X.
To 8.X should be 1 extra steps away.

However, the problem is customers will be replacing all their existing
7940/60 series IP phones to newer 8 series.

If customer prefer to keep their existing user settings like speed dial on
each individual phones, what's the best way to do it?

Any tricks to run some sort of commands on the CM 3.3 SQL and extract the
neccessary information? I don't mind setting up everything
(partition/css/route pattern) all over again except those user/phone
configurations (such as extension number/speed dial buttons/personal speed
dial in their user profiles)
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