Yealink SIP-T48G Administrator's Manual page 111

The common picture format can be *.gif/*.jpg/*.png/*.bmp. Yealink IP phones only
support the *.dob format logo files. Yealink provides PictureExDemo tool to convert
*.gif/*.jpg/*.png/*.bmp format to *.dob format. You can ask the distributor or Yealink FAE
for the PictureExDemo tool.
To customize a dob formatted logo file using the PictureExDemo tool:
1. Double click the PictureExDemo.exe.
2. Click Add button to open a *.gif/*.jpg/*.png/*.bmp file.
You can repeat the second step to add multiple original picture files.
3. Click the Convert button.
Then you can find the DOB logo files in the adv directory.
Configuring Basic Features
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