There was a similar issue in verto communicator issue, are you using the same or a different audio tag?

On Monday, May 9, 2016, Gregor Nanger <gregor@infomedia.si> wrote:
Hi!

I need some advice.

I am using verto and created client by myself from base of demo. Now I have one problem and cannot solve it.

If user is in call and he gets another call in background (call waiting). Audio from active call is lost. Call is active, but cannot hear audio.

Is this something that I overlooked in javascript?

Best regards, Gregor