VoWiFi is not working on the Jio network (BSNL Fiber)

Hi,

I'm not been able to use the VoWiFi feature with my BSNL Fibre (NextDNS enabled) and my mobile network is Jio. So I tried changing the DNS to Google on my router and surprisingly the VoWiFi is back. I think the issue is lying with NextDNS. If so please fix it.

Thank You.