Airtel Wi-Fi Calling (VoWiFi) launched officially

and just remembered that dad's phone is also not connecting to vowifi for the last couple of days. i imagine this all started when i turned on NextDNS on my core router. this is going to be a problem.
 
My dad's phone(Infinix Note 5 pro) has been facing this issue for more than a month. It is inactive throughout the day, activate airplane mode... If I am lucky enough vowifi may work else not.
However, I don't have this issue with my phone (Realme XT).
Tried on MTNL ISP.
 
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