I've never tried to do anything with mine that I would need inbound tones.
Out of curiosity what are you trying to do with it?

My only complaint is that no matter who I talk to, in bound or out bound, I have to yell for them to hear me. It makes no difference which computer I use either. A few months ago I checked the forums and I'm not the only one with the problem but I've not seen a solution to the problem.