Wi-Fi Calling not working on ASUS Router

[Spartan]

Yes, but since it works from his friends house, that should not be the issue here.
Also the phone settings should be ok (same logic).

@Spartan : You're using AIMesh. Try connecting directly to your main router (just create a test guest network) to see if that works.

I created a guest network and connected to it. No difference. I am sitting right next to the main router by the way, not the node.

I am going to that friend's house again tomorrow so when I'm connected there and see that WiFi calling icon, I'm gonna turn on Airplane mode but keep Wi-Fi on to see if it actually works and I can really make a call without cellular coverage.

 

[Poul Bak]

I created a guest network and connected to it. No difference. I am sitting right next to the main router by the way, not the node.

Well, desperate times needs desperate methods
It was just a test. I'm out of ideas.

 

[Ripshod]

I am going to that friend's house again tomorrow

While you're there see if they have IPv6 enabled. I think hat's a major thing we haven't covered yet.

 

[Tech9]

Not working for me on any phone, mobile provider or ISP here in Europe. If I cut off the mobile network - no calling features. Good thing the voice/data plans are much cheaper than what we have in Canada, the coverage is everywhere I need to go and similar voice/data roaming between EU countries is included.

 

[nickie]

Not working for me on any phone, mobile provider or ISP here in Europe. If I cut off the mobile network - no calling features. Good thing the voice/data plans are much cheaper than what we have in Canada, the coverage is everywhere I need to go and similar voice/data roaming between EU countries is included.

This is most likely due to mobile provider strategy. I live in Portugal and i know my provider (NOS) allows wifi calling when in Portugal but not not when connecting at another country. Another operator (meo) allows wifi calling both inside and outside of Portugal. So it all depends on the mobile provider decisions and it's not something similar in all european countries.

 

[jzchen]

This is most likely due to mobile provider strategy. I live in Portugal and i know my provider (NOS) allows wifi calling when in Portugal but not not when connecting at another country. Another operator (meo) allows wifi calling both inside and outside of Portugal. So it all depends on the mobile provider decisions and it's not something similar in all european countries.

Are you referring to carrier locked phones or unlocked?

 

[sfx2000]

Are you referring to carrier locked phones or unlocked?

We're getting a bit off here, as OP says his devices work with his neighbor's network, just not his own...

In the US - Open Market handsets vs Carrier Stock - OpenMarket devices are spec compliant with 3GPP along with certifications like PTCRB, but might not have support for specific customer services...

I have a OnePlus Nord 5G that works with wifi calling on T-Mobile US, but does not with ATT or Verizon - the Nord 5G being OpenMarket, much like OP's Vivo device...

I'm going to assume that his mobile device does support VoWIFI, including the device vendor, the carrier services/bundle file, SIM card - otherwise it would not work at all...

So - there is still the question about OP's ISP vs his neighbor's ISP - are they the same?

If they are the same - then yes, maybe something with the Asus router setup/config - if the ISP is different, then the best course of advice is for OP to contact his wireless provider...

 

[nickie]

Are you referring to carrier locked phones or unlocked?

Same phone unlocked. In Portugal all phones are sold unlocked. Not sure if this is due to legislation.

 

[Spartan]

We're getting a bit off here, as OP says his devices work with his neighbor's network, just not his own...

In the US - Open Market handsets vs Carrier Stock - OpenMarket devices are spec compliant with 3GPP along with certifications like PTCRB, but might not have support for specific customer services...

I have a OnePlus Nord 5G that works with wifi calling on T-Mobile US, but does not with ATT or Verizon - the Nord 5G being OpenMarket, much like OP's Vivo device...

I'm going to assume that his mobile device does support VoWIFI, including the device vendor, the carrier services/bundle file, SIM card - otherwise it would not work at all...

So - there is still the question about OP's ISP vs his neighbor's ISP - are they the same?

If they are the same - then yes, maybe something with the Asus router setup/config - if the ISP is different, then the best course of advice is for OP to contact his wireless provider...

My ISP is Du while my friend's ISP is Etisalat. Today I am testing if it actually works; if it did, I might give Du a call to see if they support it but I have a feeling that it is from the router because a few months back when I was using the ASUS RT-BE92U as my main router and I was actually using Etisalat back then, I still didn't have the WiFi calling icon.

From Google Gemini:

Yes, du does support WiFi Calling (also known as VoWiFi) in Dubai, but there are some specific technical and regional conditions you should be aware of.1

Key Things to Know​

• Availability: WiFi Calling is generally available for most du postpaid and prepaid customers. It allows you to make and receive calls and SMS over a Wi-Fi connection when your cellular signal is weak.
• The "Same Network" Rule: In many cases, users report that WiFi Calling only works reliably when your du SIM is connected to a du Home Wi-Fi (broadband) connection. It may not always activate if you are using an Etisalat Wi-Fi connection, though this can vary by device.
• International Use: Unlike many international carriers, du's WiFi Calling is typically restricted or does not work outside the UAE. If you are abroad and try to use it, the service often fails to connect due to local regulatory restrictions on VoIP and carrier-specific blocks.
• Costs: Calls made over WiFi are usually billed the same as regular cellular calls (taken from your local minutes or charged at standard rates).

How to Enable It​

If your phone is compatible, you can turn it on in your settings:

For iPhone:

1. Go to Settings > Phone.
2. Tap Wi-Fi Calling.
3. Toggle Wi-Fi Calling on This iPhone to ON.

For Android (Samsung/others):

1. Open the Phone app.
2. Tap the three dots (Menu) > Settings.2
   
   
   
   
3. Look for Wi-Fi Calling and switch it ON.3
   
   
   
   • Note: On some models, this is found under Settings > Connections.

Troubleshooting​

If you’ve enabled it but don't see "du WiFi" or the WiFi icon in your status bar:

• Check Signal Strength: The feature often only triggers when your cellular signal drops below a certain threshold.
• Update Software: Ensure your phone is running the latest carrier settings (Settings > General > About on iPhone often triggers a prompt if one is available).
• Device Compatibility: Most modern iPhones (iPhone 6s and later) and Samsung S-series/A-series phones sold in the UAE support this.

 

[Tech9]

This is most likely due to mobile provider strategy.

I never bothered to find out because my NA operator phones in EU charge ridicules amounts regardless of communication channel and my EU operator phones move around in different countries and connect to different ISPs. Too many unknowns in the equation, no mobile operator coverage issues present and at the end of the day I pay the same monthly fees. Worth investigating only if Wi-Fi calling is the only option.