I'm using Unified Communication Manager (Call Manager) 7.1.5, and supporting 3000 IP Phones, I was successfully able to customize a background image for IP Phones model 9971, 7975, 7970 and 7945.
The issue: users need to select the customized image, is there a way were I can force the customized image to be the default image and display it on all the IP Phones? without using any third party application, I want to do it directly from the call manager.
I did a write up on this a while back that may still be relevant. In the write up I talk about Cisco's Phone Designer, a method to programmitically do this, and a reference to a 3rd party app that claims to solve the problem you are talking about.
Unfortunately, you can't push this directly from CUCM.
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