Hi guys , my first post. Sorry If i write by wrong way. In my company (ISP) , we have a "sip trunk " provided by another company. The service work fine with Softphone, but when i registre my 3CX virtual appliance , in first moment works like a charm. A few minutes later the trunk is unavailable. I've vetted the issues of connectivity, routing, DNS, and so on. Currently the appliance uses an internet IP directly (as we call here in Brazil, a valid ip), ie, it does not go through any type of NAT until arriving at my SIP provider. I am attaching an image of the LOG, if any of you have been through the same experience and want to share with me, I thank you.