VAPI does not register to SIP, no calls received

I am having trouble getting VAPI to register to an external SIP (I have tried freeswitch from AWS and it connects correctly, I get the call).

When I set it up in VAPI a voice tells me that it is not possible to communicate with the phone. I suspect that VAPI has not registered correctly to the SIP. how can I get a log of these failures? I have checked api logs but nothing.

Any idea what could be going wrong?
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