Add White Noise to Phone

[justinmarthaler]

We just rolled out Zoom Phone.  One thing people have noticed is that when a person is not talking, it is completely silent.  Zoom's audio codec suppression does such a good job that people think the call may be disconnected or the other person hung up.  Is there any way to introduce a bit of low level white noise or "comfort noise" into the silent portions of a phone call?