Samsung HM6400 - Manual (Page 26)

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Ending a call
Press the Talk button to end a call.
Rejecting a call
Press and hold the Talk button to reject a call when a call comes in.
You can also say
“Ignore” when you hear “Call from [Phone number]. Say Answer
or Ignore”.
When two calls from the two connected phones come in, you can reject the call of
the first phone.
This function is available only on the Hands-Free profile. For more information, see
your phone’s user manual.