Audio settings hierarchy
========================

Service		org.ofono
Interface	org.ofono.AudioSettings
Object path	[variable prefix]/{modem0,modem1,...}

Methods		dict GetProperties()

			Returns all audio settings properties. See the
			properties section for available properties.

Signals		PropertyChanged(string property, variant value)

			This signal indicates a changed value of the given
			property.

Properties	boolean Active [readonly] [EXPERIMENTAL]

			Indicates if an audio PCM stream is active or not.

			This is not supported by all modems. Only modems
			where the audio data can be routed to the host
			application processor will support this.

		string Mode [readonly, optional] [EXPERIMENTAL]

			Indicates the audio mode setting.

			This is highly modem specific audio string. Every
			modem might use different ones.