Over the past couple of days I’ve noticed intermittent connectivity to the Telus voice over wifi (voWifi) servers, where it will pop up every couple of hours (to every few minutes) asking me to re-register.
Telus recommends using Google (188.8.131.52) so I don’t know if they are relying on something specific Google’s DNS is doing differently than Cloudflare (EDNS?).
I’ve tried disabling DNSSEC on Cloudflare and the problem persists, but if I set DNS back to Google, it works fine without getting disconnected or having to re-register.
Full disclosure is I don’t know what actual domains Telus is attempting to connect to other than seeing some CDN addresses in my logs (cdn.telus.com).
I’m willing to help troubleshoot this as I require voWifi since my home office is in my basement and I don’t get great reception down here