Problem with sending DTMF tones from android app over an active call

The DTMF tones are getting generated on my Experia 10 [Android 2.1]. The problem is, I was expecting this kind of behavior :- I call a number, and the call is accepted at the other end. Then I run my application, and I generate DTMF tones from the app. and the same tones should be received at the other end of the call. But this is not happening. I want to know a way, us开发者_开发知识库ing which I can send DTMF signals over to the other end through a normal phone call. Is there a way to intercept an outgoing call and generate DTMF in between that call ? Please help ! Got stuck with this ! Thank you in advance !

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I want to know a way, using which I can send DTMF signals over to the other end through a normal phone call.

Android applications have no access to the in-call audio stream. You can fake a it a bit in speakerphone mode.

Is there a way to intercept an outgoing call and generate DTMF in between that call ?

No.