the plugin was using python-dbus which is deprecated in the backend in the favor of
TxDBus. Methods calls have been updated, and the plugin works again, but there seems to be
still some issues (warnings in the logs). Those will be fixed later.
This command has 2 subcommands: `make` and `receive` to make a new call or wait for one.
When call is in progress, a window will be created to show incoming stream and local
feedback, and a text UI is available to (un)mute audio or video, and hang up.
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it may be necessary to run some async cleaning method (e.g. if bridge is needed), this new
method handles async cleaning method, and will be called when `SystemExit` is used, or if
`a_quit` is called explicitely.
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