Yealink SIP-T21 - Manual (Page 54)

User Guide for the SIP-T21P/SIP-T21 IP Phone
44
The LCD screen prompts "Delete all records?".
5. Press the OK soft key to confirm the deletion or the Cancel soft key to cancel.
You can upload your custom logo which will be shown on the idle screen.
To upload a custom logo via web user interface:
1. Click on Features->General Information.
2. Select Custom Logo from the pull-down list of Use Logo.
3. Click Browse to locate the logo file from your local system.
4. Click Upload to upload the file.