start Free Call
@ExperimentalCoroutinesApi
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Call this method to start a new audio VoIP call
Note : the audio sink feature will be enabled automatically for this method.
Return
Flow STWAudioSink : abstract class can be : STWAudioSinkCall : the call is started, it contain an instance of the call or the error if the start fail. STWAudioSinkCapture : when the capture is ready, has data and when it is ended(each state is identified by an event from AudioSinkEvent. STWAudioSinkPlay : when the capture is ready, has data and when it is ended(each state is identified by an event from AudioSinkEvent.