I want to get the speaker volume and mute switch value of the smartphone terminal from Unity.

We use Unity 4.6 to develop apps for iOS and Android.
Sound audioSource.Play() and
Wait while yield return new WaitForSeconds (1.0f); rings.

when the volume of the terminal speaker is zero or when the mute switch is turned on in iOS I'd like to proceed without making a sound (no waiting), but
Is there a way to access the speakers from the Unity script?
(You only need to 」get や the volume or switch, and you don't have to change it.)
Also, can a native plug-in handle it?

As a result of the investigation, the volume of the microphone was acquired, but I couldn't find the information on the speakers, so I asked you a question.
If anyone knows anything, I would appreciate it if you could let me know.