wifi calling worked at work on android phone but not on new iphone

[Bazza3]

Hi,

Where I work there is no mobile phone signal and I rely on wifi calling over the corporate wifi.

I had an android phone and had no issue with wifi calling but I recently switched to an iphone SE (2022 3rd gen) and it will not work with wi-fi calling on the work wifi network.

Wifi calling works with no issues on my home broadband network so theer are no issues with the account or phone setup.

The IT support have had a look and can find no problems, the ports for O2 wifi calling are all enabled in the network and other users on O2 are working ( including my previous android phone ) and they have run out of suggestions.

Is there any know differences in iphone vs android on O2 that could be causing this ?

[Enlli]

Wifi calling should be the same on both.

On O2 the only difference is iData needs to be added to your account for iMessage and Facetime to work, but I've not heard of it messing with WiFi Calling 

[Bazza3]

There is a difference somewhere as my iphone will definitely not work with wi-fi calling at work. IT department have been looking for me and so far have not identified what the problem is.

[Enlli]

@madasaf1sh Have you seen this problem?

[pgn]

While @madasaf1sh collects his thoughts, and assuming your office network is equipped to support iPhone as well as it supports Android, @Bazza3 -

Make sure latest iOS updates are in place on your handset.

https://support.apple.com/en-gb/108066

If you've contacted your network provider and can’t turn on Wi-Fi Calling or make a Wi-Fi call, follow these steps. Wait two minutes before you go from one step to the next.

1. Go to Settings > Phone > Wi-Fi Calling and make sure Wi-Fi Calling is on.

2. Restart your iPhone.

3. Connect to a different Wi-Fi network. Not all Wi-Fi networks work with Wi-Fi Calling.

4. Turn Wi-Fi Calling off and then on again.

5. Go to Settings > General > Transfer or Reset iPhone > Reset.

6. Tap Reset Network Settings.

[madasaf1sh]

@pgn @Enlli @Bazza3 

There is no difference between IOS and Android with regards to WiFi Calling as the VoWIFI is a GSM standard and as such the ports required to be opened on any network are the same...  

We have both IOS and Android phones (from iPhone 8's to 16 Pro Max's and Android devices from Android 9 to 16 DP2 dont ask) on our WiFi networks and we don't do anything different for either...

If your Network Team can, then do a packet capture of the connection from Device to Switch to the Egress on the Network... 
I would also make sure Private Relay is switched off on the iPhone SE, as this routes traffic away from the WiFi network 

[Bazza3]

Thanks for replies. It guy took a trace and couldn’t find any traffic blocked by the network. He wasn’t able to drill into the exchanges but could see traffic to and fro o2 domain. None the wiser what the issue is.

I’d not heard of private relay before but after searching I don’t have it enabled.

[Bazza3]

Hi,

work WiFi supports WiFi calling and I had it working on my old android phone.

iPhone is all up to date and WiFi calling works at home on my home broadband so account etc is all setup ok.

very frustrating but there must be a cause  somewhere 

[madasaf1sh]

@Bazza3 

You need to get the IT guy, to pass it to who ever supports the WiFi Infrastructure to do a packet inspection, and actually inspect each TCP/IP or UDP packet as it travels over the network, a ping, pathing or tracert proves nothing.. 

What domain is he is seeing traffic to? , as it might not even be related to VoWIFI 

Can you browse the Internet or access corporate resources whilst connected to the WiFi, is there a Guest and Corporate SSID

To be honest this is bordering on fixing your companies network infrastructure... but that is where the problem  is? 

Having deployed WiFi Calling on an Enterprise level across Cisco Kit, and multiple SSID's used by IOS and Android, again as I said earlier no changes for separate devices...

[MI5]

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@madasaf1sh wrote:

Having deployed WiFi Calling on an Enterprise level across Cisco Kit, and multiple SSID's used by IOS and Android, again as I said earlier no changes for separate devices...

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So if it's working on Android and other iPhone devices, the issue is not a network infrastructure issue?