Samsung BHM1200NBACSTA - Manual (Page 21)

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Placing a call on hold
Press and hold the Talk button to place the current call on hold.
When the headset is connected with two phones, this function is not available. •
This function is only available when using the Hands-Free profile. •
Answering a second call
Press the Talk button to end the first call and answer a second call. •
Press and hold the Talk button to place the first call on hold and answer a second call. To •
switch between the current call and the held call, press and hold the Talk button.
This function is only available when using the Hands-Free profile.