change background picture on DID

Is there a way to change the background picture on the spa962 based on the DID? Id like the phone to display a different logo based on the incoming line.

I see the spa962.cfg file has a group attribute in the picture/logo config but its difficult to find any detailed provisioning info for these phones to see if this is possible. I keep running into "Service provider only" nonsense when searching for relevant docs.

Thanks for any help