Hey JFV,

Maybe this will help

Phone Personalization Information

Phone Personalization From the drop-down list box, enable or disable the personalization
settings on the phone, or choose Default to use the phone personalization
that is set in the Common Phone Profile. You can choose one of the
following options:
• Disabled—None of the personalization settings on the phone get
activated.
• Enabled—This setting accepts a personalized background image
file, which is used for the phone screen; it accepts a preview image
file for temporary display; and it accepts a personalized tone file, so
the default ring tone can be personalized.
• Default—Use the phone personalization setting that is in the
Common Phone Profile.

Services Provisioning From the drop-down list box, choose whether the phone will use the
services provisioned in the phone configuration file (Internal), services
received from an external URL (External URL), or both.
The default specifies Internal. Select External URL if you are using an
external provisioning server or Both if are using an external server but
also want to allow users to subscribe to services in Cisco Unified
Communications Manager.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/7_0_1/ccmcfg/b06cpprf.pdf

Cheers!
Rob