In the file on your TFTP server SIPDefault.cnf in the section where you find these lines.
# XML URLs
services_url: "" ; URL for external Phone Services
directory_url: "" ; URL for external Directory location
logo_url: "" ; URL for branding logo to be used on phone display
change the ""after logo_url in thericht file taking in account
(Optional) Location of the company logo file. This logo appears on the phone display. The background space allocated for the image is 90 x 56 pixels. Images that are larger than this will automatically be scaled down to 90 x 56 pixels. The recommended file size for the image is from 5 to 15 Kb. For example, use logo_url: "http://10.10.10.10/companylogo.bmp".
Note This parameter supports Windows 256 color bitmap format only. CMXML PhoneImage objects are not supported for this parameter. Using anything other than a Windows bitmap (.bmp) file can cause unpredictable results.
Cisco SIP IP Phone Administrator Guide, Versions 6.0 to 7.4
Appendix D - Configurable Parameters for the SIP IP Phone (Versions 6.0 to 7.4)
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