Samsung BHS3000NBACSTA - Manual (Page 27)

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Answering a call
Press the Talk button to answer a call when you hear incoming call tones.
If you receive calls on both connected devices at the same time you can only answer
the call on the primary phone.
When you are listening to music, the music stops during a call.
Ending a call
Press the Talk button to end a call. You will hear “Call terminated.”
Rejecting a call
Press and hold the Talk button to reject a call when a call comes in.
You will hear “Call terminated.”
If you receive calls on both connected devices at the same time you can only reject
the call on the primary phone.
This function is only available when using the Hands‑Free profile. For more
information, see your phone’s user manual.