My IPhone 3cx app works fine on our internal Wifi. But over LTE when I'm out and about, it just says Registering/Connecting/Timeout. Firewall checker is all fine except a problem on port 5060, but the 3cx webpage that shows the ports needed doesn't make it appear that the 3CX client needs 5060. The PBX works fine in all other aspects other than this problem with the 3CX client over LTE. So I am thinking that the problem reported by firewall checker is not relevant here. I've toggled my extension's switch to use the tunnel off and on several times. The firewall checker reports that port 5090 works fine, so toggling the tunnel on for my extension should theoretically work, right? Any ideas on what to do next?