Audio Manager's setSpeakerphoneOn () method generates interference.

I am using Sinch to implement a voice call "App to App".

My problem arises when I try to activate the speaker.

I created an instance of audio manager in the onCreate () of my activity:

AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);

I have a button that activates the speaker, using the following instructions:

final Handler mHandler = new Handler();
mHandler.postDelayed(new Runnable() {
    @Override
    public void run() {
        audioManager.setMode(AudioManager.MODE_IN_CALL);
        audioManager.setSpeakerphoneOn(true);
    }
}, 500);

The above does activate the speaker, however, it generates very annoying interference or noise.

I have tried to eliminate the line

audioManager.setMode (AudioManager.MODE_IN_CALL); '

and increase the delay from 500 to 2000 as suggested by some response to this problem, but none of this has given me results.

I appreciate your answers.