Samsung BHM1800NDACSTA - Manual (Page 19)

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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 latest number dialed on the primary phone:
Press and hold 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.