Samsung HM1200 사용자 설명서

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Using call functions
Available call functions may differ from phone to phone.
Some functions are only available when using the Hands-Free profile. 
Making a call
Redialing the latest number
To redial the last number dialed on the primary phone:
Press the Talk button.

To redial the last 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.