android: audiotrack to voice call

Programmer Question

hi all,
i'm trying to play a sample to voice call uplink stream...

int minSize =AudioTrack.getMinBufferSize( 44100, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT );
final AudioTrack track = new AudioTrack( AudioManager.STREAM_VOICE_CALL, 44100,
AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT,
minSize, AudioTrack.MODE_STREAM);
track.play();

and then send data to the stream...but it does not play to the calling phone...

is it maybe a problem with AudioManager, but how may i configure the routing process?

thanks in advance,
regards

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