This cable connects to the phone's headset port and directly to the H-series headset. When you press the headset button on the phone, the audio is routed to the headset. It's a bit quiet, but you can turn it up with the volume knob on your phone. The volume of speech seemed fairly normal. The great thing about this cable is that you do NOT need an amplifier box and you can use all the buttons on your phone to toggle and mute.
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