[android-developers] To implement DTMF in android

Hi

After googling, I found to send DTMF as

Intent mIntent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" +
phoneNumber + ";" + dtmfSequence));

but this works only first time when call started, if users presses any
number of dialpad then how can I send these dtmf sequences while the
ongoing call session?

Should I use SIP/VoIP, Which one is better approach among DTMF or SIP?
VoIP ?

Please provide any example or code or any website link.

Thanks
Test

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