Yealink SIP-T21 - Manual (Page 46)

User Guide for the SIP-T21P/SIP-T21 IP Phone
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The LCD screen displays the search results in the adjusted order.
6. Click Confirm to accept the change.
Note
To search for a contact in the enabled search source lists:
1. Pick up the handset, press the speakerphone or press the line key.
2. Enter a few continuous characters of the contact name or number using the keypad.
The contacts in the enabled search source lists whose name or number matches the
characters entered will appear on the LCD screen. You can press or to
select the desired contact and then place a call to the contact.
Search source list in dialing is configurable via web user interface only.