Yealink SIP-T48G - Manual (Page 55)

Customizing Your Phone
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3. Click Upload Photo to upload the photo.
You can click Delete Photo to delete the custom photo.
Note
To change the custom photo for the contact via web user interface:
1. Click on Directory->Local Directory.
2. Click the desired entry you want to edit.
3. Select the desired photo from the pull-down list of Photo.
4. Click Edit to accept the change.
When you place a call to the contact or receive a call from the contact, the touch screen
will display the contact photo.
The phone only supports the *.png, *.jpg and .bmp format files. The file size must be less
than 5M.
You can only delete the custom photo.