ok, I checked "Bind to Media Server" for my PTSN Line and now it's works for all internal extensions when someone call me on this PTSN line.
but now when I try to pick up the call from an external extension( analogue phone plugged on the fxs of my voip gateway) I can hear but the guy can't hear me ..... ( it works between these extensions and my others internal extensions).
I can't also phone outside using my ptsn line from any extensions ( but I can use my voip lines) maybe the problem is in my voip gateway configuration....
I'm so close, to do what I want with this great software !!