background question phone settings

good morning to all

I turn to you with a question

I use this line in my template

<Bg>
     <Bg.color bg.color.selection = "2.1" />
     <bg.color.bmbg.color.bm.1.name="http://%BWDEVICEACCESSFQDN%:%BWDEVICEACCESSPORT%/%BWDMSCONTEXT%/%BWDEVICEACCESSURI%walpaper1.jpg"/>
     </ Bg>

but does not ask the file of the background and do not put it on the phone

I need something in my line?

regards
Thank you