Airtel Wifi-calling is not working on a Openwrt router. What could be the reason?

[itachi]

Jio is working.

It is just default openwrt settings +Google DNS + ppoe bsnl

 

[a.c]

Works for me. Default openwrt+cloudflare dns+pppoe excitel.

 

[itachi]

@a.c Which version are you using and on which device?

I was able to find another user with the same problem

Wifi calling DNS request get rejected but why?

I have an Archer C7v2 with OpenWrt 18.06.1 and an Android smart phone that supports Wifi calling. The phone is doing a DNS request to epdg.epc.mnc001.mcc262.pub.3gppnetwork.org to get the Wifi calling server IP for my Provider. That works when I let the Openwrt dnsmasq answer the query...

forum.openwrt.org

 

[a.c]

OpenWrt 21.02.1 r16325-88151b8303 on Archer A7.
VoWiFi on Poco X3 Pro.

 

[itachi]

@a.c How did you get openwrt up? do you have any custom rules? or just default?

 

[a.c]

Everything default. Only touched the dns resolver and added the usual Luci adblock service.

 

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[Aashish.007]

Reset network settings on your phone, also add cloudflare.
Even my router is openwrt with adguard home addon.

 

[Adithya]

Airtel sometimes is really picky with DNS for wifi calling, try the isp one and see if it works.

 

[itachi]

When i enabled ipv6 on openwrt, the issue went away.