This topic has been covered hundreds, and hundreds, and hundreds of times at CSC, a simple search will provide you all the information on this.
Only 89XX and 99XX can be configured via CUCM to load a specific background, for all other models, all the previous threads on CSC have the answer to that one, which is no.
If you want to see the alternatives and what can be done, do a quick search.
HTH
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate