To open microphone simply press the microphone button next to the target group, in the left side of the panel.
If no intercom call was open to that group, a new - temporary - connection is created.
The microphone is then opened on the intercom and user is talking to every person connected to the group (members and temporary connected users).
To close the microphone, press the microphone button again.
If the user is not member of the intercom group, the temporary connection is closed.
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