D-Link DPH-850S User Manual page 7

When the phone call is ringing, press this button to turn
off the ring tips.
Confirm key.
Delete key.
R/Send key. Use the key to dial the last call number. It
also could be used to make a phone call by sending a
phone number.
Navigation key.
Menu key.
Phone book. Tap to enter the contacts interface.
Call log. Tap to see call log.
Headset key.
Digital keyboard.
The hands-free key.
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