I've registered a SIP trunk on 2 different 3CX servers, one at a time, version 12 and version 14. SIP trunk works on version 12. As in I call the number and can forward to an extension or outside number such as my mobile. When the SIP trunk is registered on the version 14 system calls don't go through. It just rings for 5-10 seconds and say "number not available/ call could not be completed at this time". Is there anything i'm missing on the 3cx v14 system? As far as I know, port forwarding is enabled.