This happens when UA sends `REGISTER` from a port that doesn't match the one
advertised in a `CONTACT` header (for example there is a port translation (like
PAT) on your firewall, or maybe a bug in UA 🤷)
Kamailio will store `AoR` with a port from `CONTACT`, and this may be not
reachable. As an example see attached pictures with Zoiper and TCP: `REGISTER`
packet received from port **50376** but AoR stored with port **60320**. Trying
to connect to that port failed and thus error message from `tcp_do_connect()`
<img width="1024" alt="kamailio_nat_issue_1"
src="https://github.com/user-attachments/assets/50e543ac-8d8f-4725-8e68-fc1f55fbb57a";>
<img width="705" alt="kamailio_nat_issue_2"
src="https://github.com/user-attachments/assets/ce3e05bc-01de-4e3b-bec6-3cd02694eecd";>
<img width="1275" alt="kamailio_nat_issue_3"
src="https://github.com/user-attachments/assets/92fb56b3-2822-4d8e-b31a-dd83d6a3e838";>
👉 To fix that define `WITH_NAT`, use `received_avp` parameter of the
`nathelper` module and the `registrar` module, and use `fix_nated_register()`
for the `registrar` to store it in the received column in the location table
<img width="1044" alt="kamailio_nat_issue_5_fix"
src="https://github.com/user-attachments/assets/764578cc-359a-440f-afa9-c329abe95c56";>
<img width="684" alt="kamailio_nat_issue_4_fix"
src="https://github.com/user-attachments/assets/23934bd4-f2b5-4e2e-91b4-682f47fa154c";>
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