Yealink SIP-T48G - Manual (Page 54)

User Guide for the SIP-T48G IP Phone
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If Local Directory is disabled for the directory, tap ->All Contacts or tap ->
Directory ->All Contacts to enter the local directory.
2. Tap Setting.
3. Tap the checkbox of Select All.
4. Tap Delete.
The touch screen prompts the following warning:
5. Tap the OK soft key to confirm the deletion or the Cancel soft key to cancel.
To upload a new custom photo for a contact via web user interface:
1. Click on Directory->Local Directory.
2. Click Browse, and then locate a photo file from your local computer.