iOS app not registering while on the same network

[FuTech-Nel]

I have a PBX with v20 on a Windows 10 Pro computer. The iOS app is on an iPhone 14 Pro Max running iOS v 18.3.2.

When a call comes in to the PBX and goes to the queue the phone will ring but when the user answers on the app the extension shows that it is not registered and stuck connecting.

But when the iPhone is connected to the carrier or another wifi network the app connects.

 

[SteveITS]

Is split DNS set up? Can you browse to the server login page from the phone?

 

[FuTech-Nel]

Is split DNS set up? Can you browse to the server login page from the phone?

No split DNS

 

[SteveITS]

You will need that
https://www.3cx.com/docs/creating-fqdn-split-dns/

 

[FuTech-Nel]

You will need that
https://www.3cx.com/docs/creating-fqdn-split-dns/

The FQDN is the one supplied by 3CX itself, and I can navigate to it with no issue.

 

[bitn2]

The FQDN is the one supplied by 3CX itself, and I can navigate to it with no issue.

That doenst matter, you need split dns to solve your problem.

 

[FuTech-Nel]

That doenst matter, you need split dns to solve your problem.

OK, but explain to me why I need to do this suddenly. I do not need to do this on other installations. I navigated to the FQDN both internally and externally

 

[bitn2]

Depends on your firewall... If Hairpin Nat doesnt work correctly you need split dns to solve this problem.