My Digi WiFi Calling is working in both home and office. My office is using a firewall as router, no issue for me even I can't log in to the firewall. At my home now, I also did not do anything about the settings in my router. I am using Asus router. My phone just straight switch to WiFi Calling as long as my phone is connected to WiFi. Even is on car, I'm using my TP-Link Mifi, when my phone connected to my car Mifi, it will straight switch to Digi WiFi Calling.