Keys
Function keys
Key
Function when key is pressed
s
End (disconnect) call.
,
Redialing
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r
Button for call forwarding (with red LED)
O
Open mailbox (with red LED key)
N
Open the phone's main menu (with red LED key)
Audio keys
Key
Function when key is pressed
o
Activate/deactivate headset
p
Activate/deactivate microphone (also for speakerphone mode)
-
Set volume lower and contrast brighter
n
Turn speaker on/off (with red LED key)
+
Set volume higher and contrast darker
Getting to know your Octophon F640 TDM phone
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