The problem of Microphone.getEnhancedMicrophone() in AIR SDK 23

I am developing an android and iOS chatting app using air SDK 23.0 in flash builder 4.7.

The chatting server is Red5 0.6.

The mobile source code is following.

var devMic:Microphone = Microphone.getEnhancedMicrophone(); 

devMic.setUseEchoSuppression(true);

devMic.setLoopBack(false); 

devMic.gain = 80; 

devMic.rate = 11;

devMic.codec = SoundCodec.NELLYMOSER; 

devMic.addEventListener(StatusEvent.STATUS, onMicStatus); 

... ... ...

outStream = new NetStream(this);

if (useMic)

    outStream.attachAudio(devMic); // the phone speaker volume is lower and is impossible to hear.

outStream.publish(chatInfo.user_id, "live");

I use Microphone.getEnhancedMicrophone() function,

In this case, the microphone volume of my android is normal and the other side hears normally.

But the phone's speaker sound is so low I can not hear each other's words.

The above problem does not occur with the iPhone.

Before AIR SDK 23 released, I used Microphone.getMicrophone() with AIR SDK 22.0, The above problem does not occur with the android but has the echo problem.

What is the cause of this problem?

Please help me...