Samsung HM3100 Manual page 45

Answering a new call of the second phone
• Press the Multi-Function button to end the first call and answer a second call
of the other phone when you hear call waiting tones.
• Press and hold the Multi-Function button to place the first call on hold and
answer a second call of the other phone when you hear call waiting tones.
• To switch between the current call and the held call, press and hold
the Multi-Function button.
This function is available only on the Hands-Free profile. For more information,
see your phone's user manual.
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