[OpenSIPS-Users] mid_registrar and nathelper problem

[Alejandro Mejia Evertsz]

Hi!
This is my first OpenSIPS installation, and I'm trying to achieve a simple
sip proxy for my office extensions to register to our PBX.
Got some configurations from samples all over docs and google searches and
everything seems to work fine until there's a call from the PBX to a
registered endpoint.
The endpoint rings, but when it answers the call, it sends OK to proxy, and
proxy to PBX, but when PBX sends ACK and proxy to endpoint, the ACK gets
lost on the proxy (never reaching the endpoint).

Same problem reported by another user on Dec. 2020 here:
https://opensips.org/pipermail/users/2020-December/044146.html
He didn't got any replies to his thread, so I would appreciate anyone's
help here.

Configuration file:
https://pastebin.com/GaQEMzmb

SIP Trace:
https://pastebin.com/3cREhszJ

As you can see, the ACK doesn't even try to leave the public (WAN)
interface of the proxy.

Thanks in advance for your help.

Alejandro
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