Samsung HM1800 用户手册

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This function is only available on the primary phone.

Press the Talk button to answer a call when a call comes in.

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.

Press the Talk button to end a call.

You can use the following functions during a call.

Adjusting the volume
Press the Volume up or down button to adjust the volume.