Wi-Fi Calling not working on ASUS Router

[Spartan]

I use Android phones and have always enabled Wi-Fi calling, I thought it just works and never paid any attention to it. This has been the case on all my past routers like the GT-AX6000, AX-86U, RT-BE92U, and now my GT-BE19000.

Recently, I was at a friend's house who has a cheap ISP-provided router. When I connected to their router, I saw the WiFi calling symbol on my phone's WiFi connection, indicating that it's working.

That made me wonder what's going on so I Googled this and Google suggested to disable SIP Passthrough so I did, then forgot the network on my phone and reconnected but it still doesn't show the Wi-Fi calling icon. Another post I saw on this forum is from one member suggesting the opposite, which is to enable SIP Passthrough but both ways it doesn't work.

Any other suggestions?

 

[bluzfanmr1]

From my experience, and I believe this is the answer, wifi calling will only kick in if your cell singal is weak or if you have no signal at all. Do you know how strong your signal was at these locations? Someone will correct me if I'm mistaken.

 

[ColinTaylor]

When my phone is on my desk it has a marginal mobile signal. The Wi-Fi calling icon frequently appears and disappears.

Looking at the phone's settings, the Wi-Fi calling preference is set to "Mobile network preferred". Changing that to "Wi-Fi preferred" makes the Wi-Fi calling icon always appear (presumably it won't if I go out of Wi-Fi range).

 

[Poul Bak]

Someone will correct me if I'm mistaken.

You are mistaken!
Don't know if it's the same all over the world but for me it requires 'IPSec passthrough'. Then I see the symbol.
And I have a strong signal: 200+ MBit/s over 5G
And I think @ColinTaylor is right, you have to set "Wi-Fi preferred" on the phone.
I also think it has to be supported by your ISP - after all it goes through their network.

 

[Tech9]

I also think it has to be supported by your ISP - after all it goes through their network.

My experience as well. Perhaps @Spartan friend is simply using different ISP.

 

[ColinTaylor]

That made me wonder what's going on so I Googled this and Google suggested to disable SIP Passthrough so I did, then forgot the network on my phone and reconnected but it still doesn't show the Wi-Fi calling icon. Another post I saw on this forum is from one member suggesting the opposite, which is to enable SIP Passthrough but both ways it doesn't work.

In my case the SIP Passthrough setting has no effect on Wi-Fi calling. Although that might vary by service provider or device (speculation). When the phone shows Wi-Fi calling as available (see my previous post) go to System Log - Connections and filter the results for a destination port of 4500. I can see my phone is maintaining a connection to my mobile service provider from an ephemeral port, so it isn't reliant on NAT passthrough.

 

[vit5421]

make sure IPSec Passthrough is enebled

 

[Spartan]

make sure IPSec Passthrough is enebled

It is enabled, still no Wi-Fi calling

 

[Ripshod]

On newer phones, particularly Pixels, the is no icon for wifi calling. The only place you can see it's active is the lock screen.

Correction - you can also see it in the pull-down settings

 

[Spartan]

On newer phones, particularly Pixels, the is no icon for wifi calling. The only place you can see it's active is the lock screen.
View attachment 69934
Correction - you can also see it in the pull-down settings
View attachment 69935

Right, but here's the thing, I have a vivo X300 Pro. At home, I don't see the icon but when I go to my friend's place as mentioned earlier, who has some crappy ISP provided router, the WiFi calling icons appears

 

[ColinTaylor]

Correction - you can also see it in the pull-down settings

Similar on my Samsung. Only appears on the pull-down settings.

 

[ColinTaylor]

Right, but here's the thing, I have a vivo X300 Pro. At home, I don't see the icon but when I go to my friend's place as mentioned earlier, who has some crappy ISP provided router, the WiFi calling icons appears

Did you check the setting I mentioned in post #3?