For multiplayer voice chat, why not do this:
Use the FAA designated Air to Air communications channels.
Add a push to talk option that transmits voice over the channels (ability for the user to enable/disable)
Set filter for distance voice is heard from other users (say 20-30nm)
This way we could hear other voice traffic making calls only if we have our radios tuned in to the right frequency and they are in the sim environment near us. (kind of like vatsim)
Could also be used for uncontrolled airport, group fly ins where you announce your intentions and others can hear you.
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