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Multiple display logos for different users on the same network

My customer is the IT department of a public sector enterprise. They have multiple internal customers on the network who belong to various agencies. Each agency wants it’s own logo on the phone display. Here is the problem statement and some solution ideas in my customer’s own words:

“We have a customer that wants their logo to be a background image that they can select for their phone.  We have updated our tftp servers with the image and made available to the customer.  We now hear that there is a requirement that only those customers should have access to that background.  Here is what the engineers have already looked at for solutions:

"First option: Identifying all of the phones in a particular subnet that require the background image, put those particular phones into a special device pool set up with a special Call Manager Group that references a special TFTP server that will host the background image of interest and modify the option 150 dhcp pool on the appropriate switch(s) so these phones only look at the special TFTP server. Issues: there are other users/groups that are also using this subnet so this does not seem to be a good working solution.

Second option: Go to each phone that requires this background and ensure that the devices is displaying the correct background image, then remove the background image from the TFTP server so that it is no longer available as a selectable image at the users phone. The biggest issue that I see in doing this is that if we had a mass reboot, for whatever reason, of the phones that require this background image, the image is no longer available to the device and will load a default background. Also, if the user at the phone were playing around with background images, once the file is no longer available on the TFTP server then the user would not be able to select the image of interest. This does not seem to be a very good working solution either due to ongoing maintenance of just the background image for certain phones.

Third option: Third party software application to push the image to only particular phones. This adds cost to the contract that is not funded."

Are there any Cisco solutions that can restrict access to the background images to specific phones / customers?

Has anyone out there solved this problem or have any comments on a better way to approach it?


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