This is available in CME only, not CCM at this point in time;
Have you looked into using this CME Feature?
System Message Display
The System Message Display feature allows you to specify a custom text or display message to appear in the lower part of the display window on display-capable IP phones. If you do not set a custom text or display message, the default message "Cisco Unified CME" is displayed.
When you specify a text message, the number of characters that can be displayed is not fixed because IP phones typically use a proportional (as opposed to fixed-width) font. There is room for approximately 30 alphanumeric characters.
The display message is refreshed with a new message after one of the following events occurs:
Busy phone goes back on-hook.
Idle phone receives a keepalive message.
Phone is restarted.
The file-display feature allows you to specify a file to display on display-capable IP phones when they are not in use. You can use this feature to provide the phone display with a system message that is refreshed at configurable intervals, similar to the way that the text message feature provides a message.
The difference between the two is that the system text message feature displays a single line of text at the bottom of the phone display, whereas the ***system display message feature can use the entire display area and contain graphic images.
SCCP: Modifying System Message Display
To modify the system message display on phone screen, perform the following steps.
2. configure terminal
4. system message text-message
5. url idle url idle-timeout seconds
System File Display: Example
The following example specifies that a file called logo.htm should be displayed on IP phones when they are not in use:
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