What's the point?
What's the point? It's not usable unless the person on the plane is yelling. On the last 3 or 4 flights I've been on I've used a VPN, Cisco Softphone, and a couple of different head sets to call into conference calls at work. I don't have a problem with hearing the other side but there is so much background noise no one could understand me speaking in a normal voice. The only choice would be to yell into the mic which I am not going to do. So I just call in to listen and Instant Message anything I have to say and let someone else read it.
I do not, have not, and will not work for AT&T/Comcast/Verizon/Charter or similar sized company.