BTW - this is with the SM on the 13.4 release (FSK in this particular case).
bp <part15sbs{at}gmail{dot}com> On 10/15/2015 1:12 PM, Bill Prince wrote:
I think we have determined that the new AT&T "WiFi calling" feature will not work with double NAT (even when the customer's router is on the DMZ). This is the same behavior we've seen on T-mobile. It seems to work if the customer router is in bridge mode, or the SM is in bridge mode.