Samsung HM1800 用户手册

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页码 132
16
Press the Talk button.

To redial the latest number dialed on the secondary phone:
Press the Talk button twice.
Some phones open the call log list. Press the Talk button again to dial the selected 
number.
Dialing a number by voice
Press and hold the Talk button.
This function is only available on the primary phone.
Answering a call
Press the Talk button to answer a call when a call comes in. 
Rejecting a call
Press and hold the Talk button to reject a call when a call comes in.
If you receive calls on both connected devices at the same time you can only 
answer or reject the call on the primary phone.