Using the volume rocker during calls is not affecting the call audio volume.

[toger5]

fixed by: #4481

This is because element X outputs audio over the media os channel but while in a call the volume rocker (hardware buttons) will affect the in-call volume.

A simple solution would be to make the volume rocker affect the media output:
https://developer.android.com/media/platform/output
setVolumeControlStream(AudioManager.STREAM_MUSIC) (or another AudioManager.)

The more proper solution would be to make the web-view output to the in-call "audio channel/sink"

[spaetz]

Same as #4459