Yealink SIP-T48G - Manual (Page 60)

User Guide for the SIP-T48G IP Phone
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It will prevent importing the title of the contact information which is located in the
first line of the CSV file.
4. Click Import CSV to import the contact list.
5. (Optional.) Mark the On radio box in the Delete Old Contacts field.
It will delete all existing contacts while importing the contact list.
6. (Optional.) Select the contact information you want to import into the local directory
from the pull-down list of Index.
7. Click Import to complete importing the contact list.