NoName :
Yes you can do peer to peer (fxs to fxo or ofxs to fxs) without a static IP using QTelNet products. The trick is in their software, they have something called the distributed dial plan … from what I see it is some type of messaging system that does all the work if an IP changes to update the dial plan. If “Gary” is reading this he sells their equipment too and may know more info.