Hello! I've got a OnePlus 5 that I've flashed with a third party ROM and enabled VoLTE and VoWIFI support on. I realise this is outside your support window (or official list of wifi calling devices, which starts with more modern OnePlus models), but ...
Ahh -- thanks. I didn't quite realise that. I tried a webchat but they weren't terribly informative.A bit of digging and it transpires the SIP gateway host is epdg.pub.epc.mnc020.mcc234.3gppnetwork.org. It mostly seems to create the IPSec tunnel afte...
