AAC Encoder not working properly in newest iphones 6s/6s plus

[pablogeek]

I'm using this classes in my project, and it is working really good for old devices. But the problem is with iphone 6s and 6s plus. You can hear some noisy and robotic voice. Can you guide me about this?

Thanks in avance and well done with this project!

[iAmNaz]

The same thing is happening to my project using the encoder. The audio would sound normal ONLY when the headset is used as the mic.