I am interested in how this works on the back end, and whether or not they're using t.38. And if they're using t.38, how reliable this service is. As someone th

I am interested in how this works on the back end, and whether or not they're using t.38. And if they're using t.38, how reliable this service is. As someone that played with -- nay, engineered -- a faxing solution over a couple of years' worth of side project time in order to facilitate playing an ARG, I can say confidently that faxing over VOIP lines ("t.38") is almost impossible to do reliably.