Hello zGansalloz,
The most probable is that you have a misconfiguration on VitalPBX, or in the VoIP provider side.
You should check if the trunk is registered against the VoIP Provider, also, if your provider uses a registering string, you must check that the registering string is ok.
If you want, we offer professional support for a low cost, and we can connect and configure your trunk for you remotely
