Cordova: WebRTC media refused

I want to build a cordova application on android that can use WebRTC to call and receive calls. I have :

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.RECORD_VIDEO" />

in my android manifest, but when I use SIPML5 to call, it tells me media stream permission denied. (See SIPML5 live demo at http://ift.tt/1C2EFw8 if required). I tried on the Google Chrome browser on my computer and on my android and it works perfectly. It asks to use my microphone, and I allow. But, once I try it as an cordova application on my android, it doesn't ask me anything, it just refuses the media.