Hi, We just installed a hosted 3CX v15 SP1 and we seem to have some issues with STUN at the remote extensions. We are not using a SBC (and don't plan to). The phones we are testing with are Yealink T19. If we use the default phone template provided by 3CX the PBX is set as the STUN host with port 5060 as STUN port. This is not working. Phones can register but there is no audio at all. If we change the STUN port to 3478 (still keeping the pbx as the stun host) we seem to have audio but then we have a delay of 6 seconds in establishing the calls. If we change the STUN host to stun_eu.3cx.com with port 3478 we have no issues with calling at all an no issues with delay. The problem we are facing here is that extensions appear in the phone tab with their internal IP and cannot be provisioned. What is the recommended way (we would expect the default template) and what can we do to fix this issue?