We have had a few WiFi calling issues on our networks as well. What I have run into is people get the ATT "Booster" and hook it up right next to their wireless router and both are on 2.4 and what do you know you have interference / signal attenuation.
I try to convince them to just unplug the booster and go straight WiFi or at least get some good separation distance between the two devices. -- Jon Lee Off-Grid Networks c.928.793.2972
