Unable to use ATT wifi calling on GL-X3000

I am using T-mobile Sim for 5g home internet it work perfect but unable to use Wifi calling via Iphone with att sim I confirm it work with ISP comcast using another router

Are you using VPN?

Can you toggle this option?

Network->NAT Settings, Enable SIM ALG.

I am not seeing that option

Maybe only available on the beta.

In this firmware can you toggle network acceleration and test?

If not working pls upgrade to beta.

Yes feature is turn off

I updated same issue

Does this post help

I connect via Surf Shark VPN and Wifi Calling is working now