You have to advertise it
https://github.com/kamailio/kamailio-wiki/blob/main/docs/cookbooks/5.8.x/core.md#advertised_port


On Wed, Jun 4, 2025, 12:02 Fernando Lopes via sr-users <sr-users@lists.kamailio.org> wrote:
I have an Azure VM with a public IP of 1x5.2x6.1x8.1x3 and a local IP of 10.0.0.4.
The SIP message received looks like this:
INVITE sip:750046850780334@1x5.2x6.1x8.1x3:5060 SIP/2.0

Will Kamailio handle this SIP message, or will it ignore it?
Right now, Kamailio is not doing anything with these messages.
If it’s supposed to handle them, can someone help me fix this issue?
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