Samsung GH68-15048A - Manual (Page 17)

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You can deactivate the use of the indicator light in Standby
mode and in Active mode.
Press and hold [▲] and [▼] to turn the indicator light on or off.
Enhanced features are available for phones that support the
Hands-Free Profile and enhanced features.
• Rejecting a call
When you receive a call, press and hold the Multi-Function
button.
Depending on your phone’s setting or type, you may only be
able to mute the ringer or this feature may not be
supported.
Turning the indicator light on or off
Using enhanced features