PLANET ICF-1700 - Manual (Page 54)

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When you receive an incoming call is not from a stored contact, the call will appear on the screen of
default contact picture, phone numbers and the location (need be opened in the Call settings), the
name will be displayed as Unknown. In the ringing view, you can choose a "forward", "Video", "Audio"
or "Reject", by simply pressing the corresponding button or the soft key.