Unable To use

Hey,
Hopefully, you are doing well. I got an issue that I wanted to switch sound from speaker to earpiece in android while I am using "https://crosswalk-project.org" web view to load a URL from where the user can calls to another user in the web view. for more simple : I just load a web URL to web view which supports web RTC. In android, the sound is coming from the speaker but I want to route it to an earpiece.
someone suggested me to use your plugin but I am confused as how to use it in android or server end.

I need you help in that , it will be appreciable thanks in advance.:)