In my application, I am sending DTMF tones (with gap using ",").
Please see the code below. If you put number as: 12345,6,7 it will dial 12345 and send 6 and 7 as dtmf tone with gap.
String url = "tel:" + number;
Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse(url));
startActivity(intent);
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