forward calls to voicemail in android?

I was searching and googleing this topic for more than 2 hours but maybe there's something wrong with my search, cuz i didnt find anything.

can somebody help me in this? any topic, tutorial, piece of code?

I want to monitor incoming calls (I think I'll 开发者_高级运维be able to do this part) and send some of them to voice mail. I'm using Android Level 8 platform 2.2

thanks...

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You can send some codes to activate call forwarding to any number at the network operator level, but might not work with ALL operators around the world.

Check here http://en.wikipedia.org/wiki/Call_forwarding

void sendCommand(String command){
    Intent intentCallForward = new Intent(Intent.ACTION_CALL);
    intentCallForward.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    Uri uri = Uri.fromParts("tel", command, "#");
    intentCallForward.setData(uri);                                
    startActivity(intentCallForward);
}

Then to forward calls

sendCommand("*21*001234567890#")

And remove call forwarding

sendCommand("##21#")

You can play around with different codes that might suit your needs better

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There is an option in Android contact list, it has column in contact's database with int value. in order to do what I asked in my question, you need to change that value in DB.

1 = forward to voicemail

0 = do nothing