Now press the Talk/Hands Free - buttonbar and you will see that the buttonbar is now in red with the word "stop".
And you will also see a level meter of which you can change the volume.
Now you can speak !! You will see a yellow sign besides your name, indicating that you are talking.
When you want to stop speaking, then press the Stop -buttonbar, and you will see the Talk/Hands Free-buttonbar again.
So, it's very simple :)

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