how to send Dtmf tone programmatically during a live call in android?

Question

I Want to send DTMF Tones programmatically in my app. While searching i found a method

public void playDtmfTone (char digit)

Is th

Answer 1

There are the so called audio streams, and so there must be a way of playing tones over the AudioManager.STREAM_VOICE_CALL or AudioManager.STREAM_DTMF ones. Actually Skype does this.

But what you can't do for sure is to play tones over a call made from other app.