ng a start function will request permission for the device indicated
						by the device id, media stream or track constraint.
						For audio input, supply null to will generate an empty audio stream.
						Calling stop to stop the input stream.
						Make sure to choose the audio input before joining the session (even if
						it is the default device) so that you can offer the user options if the
					device cannot be selected before a connection is made.</p>
					<p>Note that in certain situations such 