如何启动从HF通过AG通过免提音频网关在Android的电话吗

如何启动从HF通过AG通过免提音频网关在Android的电话吗

So far I have been able to initiate a call from the AG (Audio Gateway) which is an Android phone through bluetooth connection from the phone in which my app is loaded (the HF or Hands-free), to the target phone. I have used this code for this procedure:
///////////////////////////////////////////////////////////////////////////////
//Here, how to establish voice connectivity from AG to my phone(HF)?
//////////////////////////////////////////////////////////////////////////////

// Calling the target phone from the AG via the HF using bluetooth Handfree Audio Gateway
try {
mmOutStream.write(("ATD"+phone_number+"\r").getBytes());
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

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