I'm trying to send DTMF tones when Call waiting event arriving.
I use a toneGenerator = new ToneGenerator
(AudioManager.STREAM_VOICE_CALL, toneVolume) as the DTMF tone. But if
user set the the In-Call Volume to minimum by the hardware volume key,
It cannot hear the Call wating tone. I think this is not a right
scenario if  the Call wating tone is also muted.

If I set other audio type to the ToneGenerator, It seems also cant
guarantee that the volume of such audio type is not zero.

Is it possible to have a audio type for Call wating event or an
interface to set individual volume to one ToneGenerator?

Or is there any way to prevent the Call wating tone be muted?
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